Stewart Section 2.8: The Derivative as a Function

63문제

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Stewart Section 2.8: The Derivative as a Function 0/63
1 Derivatives - Graphing · Level 2
Use the given graph to estimate the value of each derivative. Then sketch the graph of \(f'\).
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(a) \(f'(-3)\)
(b) \(f'(-2)\)
(c) \(f'(-1)\)
(d) \(f'(0)\)
(e) \(f'(1)\)
(f) \(f'(2)\) (g) \(f'(3)\)

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2 Derivatives - Graphing · Level 2
Use the given graph to estimate the value of each derivative. Then sketch the graph of \(f'\).
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(a) \(f'(0)\)
(b) \(f'(1)\)
(c) \(f'(2)\)
(d) \(f'(3)\)
(e) \(f'(4)\)
(f) \(f'(5)\) (g) \(f'(6)\) (h) \(f'(7)\)

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3 Derivatives - Graphing · Level 3
Match the graph of each function in (a)-(d) with the graph of its derivative in I-IV. Give reasons for your choices.
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4 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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5 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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6 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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7 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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8 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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9 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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10 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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11 Derivatives - Graphing · Level 3
Trace or copy the graph of the given function \(f\). (Assume that the axes have equal scales.) Then use the method of Example 1 to sketch the graph of \(f'\) below it.
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12 Derivatives - Graphing · Level 3
Shown is the graph of the population function \(P(t)\) for yeast cells in a laboratory culture. Use the method of Example 1 to graph the derivative \(P'(t)\). What does the graph of \(P'\) tell us about the yeast population?
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13 Derivatives - Applications · Level 3
A rechargeable battery is plugged into a charger. The graph shows \(C(t)\), the percentage of full capacity that the battery reaches as a function of time \(t\) elapsed (in hours).
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(a) What is the meaning of the derivative \(C'(t)\)?
(b) Sketch the graph of \(C'(t)\). What does the graph tell you?

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14 Derivatives - Applications · Level 3
The graph (from the US Department of Energy) shows how driving speed affects gas mileage. Fuel economy \(F\) is measured in miles per gallon and speed \(v\) is measured in miles per hour.
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(a) What is the meaning of the derivative \(F'(v)\)?
(b) Sketch the graph of \(F'(v)\).
(c) At what speed should you drive if you want to save on gas?

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15 Derivatives - Applications · Level 3
The graph shows how the average age of first marriage of Japanese men varied in the last half of the 20th century. Sketch the graph of the derivative function \(M'(t)\). During which years was the derivative negative?
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16 Derivatives - Graphing · Level 3
Make a careful sketch of the graph of \(f\) and below it sketch the graph of \(f'\) in the same manner as in Exercises 4-11. Can you guess a formula for \(f'(x)\) from its graph? \(f(x) = \sin x\)
17 Derivatives - Graphing · Level 3
Make a careful sketch of the graph of \(f\) and below it sketch the graph of \(f'\) in the same manner as in Exercises 4-11. Can you guess a formula for \(f'(x)\) from its graph? \(f(x) = e^x\)
18 Derivatives - Graphing · Level 3
Make a careful sketch of the graph of \(f\) and below it sketch the graph of \(f'\) in the same manner as in Exercises 4-11. Can you guess a formula for \(f'(x)\) from its graph? \(f(x) = \ln x\)
19 Derivatives - Definition · Level 3
Let \(f(x) = x^2\).
(a) Estimate the values of \(f'(0)\), \(f'\left(\dfrac{1}{2}\right)\), \(f'(1)\), and \(f'(2)\) by using a graphing device to zoom in on the graph of \(f\).
(b) Use symmetry to deduce the values of \(f'\left(-\dfrac{1}{2}\right)\), \(f'(-1)\), and \(f'(-2)\).
(c) Use the results from parts (a) and (b) to guess a formula for \(f'(x)\).
(d) Use the definition of derivative to prove that your guess in part (c) is correct.

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20 Derivatives - Definition · Level 3
Let \(f(x) = x^3\).
(a) Estimate the values of \(f'(0)\), \(f'\left(\dfrac{1}{2}\right)\), \(f'(1)\), \(f'(2)\), and \(f'(3)\) by using a graphing device to zoom in on the graph of \(f\).
(b) Use symmetry to deduce the values of \(f'\left(-\dfrac{1}{2}\right)\), \(f'(-1)\), \(f'(-2)\), and \(f'(-3)\).
(c) Use the values from parts (a) and (b) to graph \(f'\).
(d) Guess a formula for \(f'(x)\).
(e) Use the definition of derivative to prove that your guess in part (d) is correct.

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21 Derivatives - Definition · Level 3
\( f(x) = 3x - 8 \)
22 Derivatives - Definition · Level 3
\( f(x) = m x + b \)
23 Derivatives - Definition · Level 3
\( f(t) = 2.5t^2 + 6t \)
24 Derivatives - Definition · Level 3
\( f(x) = 4 + 8x - 5x^2 \)
25 Derivatives - Definition · Level 3
\( f(x) = x^2 - 2x^3 \)
26 Derivatives - Definition · Level 3
\( g(t) = \dfrac{1}{\sqrt{t}} \)
27 Derivatives - Definition · Level 3
\( g(x) = \sqrt{9 - x} \)
28 Derivatives - Definition · Level 4
\( f(x) = \dfrac{x^2 - 1}{2x - 3} \)
29 Derivatives - Definition · Level 4
\( G(t) = \dfrac{1 - 2t}{3 + t} \)
30 Derivatives - Definition · Level 4
\( f(x) = x^{\dfrac{3}{2}} \)
31 Derivatives - Definition · Level 3
\( f(x) = x^4 \)
32 Derivatives - Graph and Definition · Level 3
(a) Sketch the graph of \(f(x) = \sqrt{6 - x}\) by starting with the graph of \(y = \sqrt{x}\) and using the transformations of Section 1.3.
(b) Use the graph from part (a) to sketch the graph of \(f'\).
(c) Use the definition of a derivative to find \(f'(x)\). What are the domains of \(f\) and \(f'\)?
(d) Use a graphing device to graph \(f'\) and compare with your sketch in part (b).

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33 Derivatives - Definition · Level 3
(a) If \(f(x) = x^4 + 2x\), find \(f'(x)\).
(b) Check to see that your answer to part (a) is reasonable by comparing the graphs of \(f\) and \(f'\).

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34 Derivatives - Definition · Level 3
(a) If \(f(x) = x + \dfrac{1}{x}\), find \(f'(x)\).
(b) Check to see that your answer to part (a) is reasonable by comparing the graphs of \(f\) and \(f'\).

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35 Derivatives - Applications · Level 3
The unemployment rate \(U(t)\) varies with time. The table gives the percentage of unemployed in the US labor force from 2003 to 2012.
(a) What is the meaning of \(U'(t)\)? What are its units?
(b) Construct a table of estimated values for \(U'(t)\).
\(t\) \(U(t)\) \(t\) \(U(t)\)
2003 6.0 2008 5.8
2004 5.5 2009 9.3
2005 5.1 2010 9.6
2006 4.6 2011 8.9
2007 4.6 2012 8.1

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36 Derivatives - Applications · Level 3
The table gives the number \(N(t)\), measured in thousands, of minimally invasive cosmetic surgery procedures performed in the United States for various years \(t\).
(a) What is the meaning of \(N'(t)\)? What are its units?
(b) Construct a table of estimated values for \(N'(t)\).
(c) Graph \(N\) and \(N'\).
(d) How would it be possible to get more accurate values for \(N'(t)\)?
\(t\) \(N(t)\) (thousands)
2000 5,500
2002 4,897
2004 7,470
2006 9,138
2008 10,897
2010 11,561
2012 13,035

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37 Derivatives - Applications · Level 3
The table gives the height as time passes of a typical pine tree grown for lumber at a managed site.
Tree age (years) 14 21 28 35 42 49
Height (feet) 41 54 64 72 78 83
If \(H(t)\) is the height of the tree after \(t\) years, construct a table of estimated values for \(H'\) and sketch its graph.
38 Derivatives - Applications · Level 3
Water temperature affects the growth rate of brook trout. The table shows the amount of weight gained by brook trout after 24 days in various water temperatures.
Temperature (degrees C) 15.5 17.7 20.0 22.4 24.4
Weight gained (g) 37.2 31.0 19.8 9.7 29.8
If \(W(x)\) is the weight gain at temperature \(x\), construct a table of estimated values for \(W'\) and sketch its graph. What are the units for \(W'(x)\)?
39 Derivatives - Interpretation · Level 3
Let \(P\) represent the percentage of a city's electrical power that is produced by solar panels \(t\) years after January 1, 2000.
(a) What does \(\dfrac{d P}{d t}\) represent in this context?
(b) Interpret the statement \(\dfrac{d P}{d t}|_{t = 2} = 3.5\)

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40 Derivatives - Interpretation · Level 3
Suppose \(N\) is the number of people in the United States who travel by car to another state for a vacation this year when the average price of gasoline is \(p\) dollars per gallon. Do you expect \(\dfrac{d N}{d p}\) to be positive or negative? Explain.
41 Derivatives - Differentiability · Level 3
The graph of \(f\) is given. State, with reasons, the numbers at which \(f\) is not differentiable.
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42 Derivatives - Differentiability · Level 3
The graph of \(f\) is given. State, with reasons, the numbers at which \(f\) is not differentiable.
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43 Derivatives - Differentiability · Level 3
The graph of \(f\) is given. State, with reasons, the numbers at which \(f\) is not differentiable.
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44 Derivatives - Differentiability · Level 3
The graph of \(f\) is given. State, with reasons, the numbers at which \(f\) is not differentiable.
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45 Derivatives - Differentiability · Level 3
Graph the function \(f(x) = x + |x|\). Zoom in repeatedly, first toward the point \((-1, 0)\) and then toward the origin. What is different about the behavior of \(f\) in the vicinity of these two points? What do you conclude about the differentiability of \(f\)?
46 Derivatives - Differentiability · Level 3
Zoom in toward the points \((1, 0)\), \((0, 1)\), and \((-1, 0)\) on the graph of the function \(g(x) = (x^2 - 1)^{\dfrac{2}{3}}\). What do you notice? Account for what you see in terms of the differentiability of \(g\).
47 Derivatives - Higher Derivatives · Level 3
The graphs of a function \(f\) and its derivative \(f'\) are shown. Which is bigger, \(f'(-1)\) or \(f''(1)\)?
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48 Derivatives - Higher Derivatives · Level 3
The graphs of a function \(f\) and its derivative \(f'\) are shown. Which is bigger, \(f'(-1)\) or \(f''(1)\)?
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49 Derivatives - Higher Derivatives · Level 3
The figure shows the graphs of \(f\), \(f'\), and \(f''\). Identify each curve, and explain your choices.
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50 Derivatives - Higher Derivatives · Level 3
The figure shows graphs of \(f\), \(f'\), \(f''\), and \(f'''\). Identify each curve, and explain your choices.
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51 Derivatives - Applications · Level 3
The figure shows the graphs of three functions. One is the position function of a car, one is the velocity of the car, and one is its acceleration. Identify each curve, and explain your choices.
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52 Derivatives - Applications · Level 3
The figure shows the graphs of four functions. One is the position function of a car, one is the velocity of the car, one is its acceleration, and one is its jerk. Identify each curve, and explain your choices.
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53 Derivatives - Higher Derivatives · Level 3
Use the definition of a derivative to find \(f'(x)\) and \(f''(x)\). Then graph \(f\), \(f'\), and \(f''\) on a common screen and check to see if your answers are reasonable. \(f(x) = 3x^2 + 2x + 1\)
54 Derivatives - Higher Derivatives · Level 3
Use the definition of a derivative to find \(f'(x)\) and \(f''(x)\). Then graph \(f\), \(f'\), and \(f''\) on a common screen and check to see if your answers are reasonable. \(f(x) = x^3 - 3x\)
55 Derivatives - Higher Derivatives · Level 4
If \(f(x) = 2x^2 - x^3\), find \(f'(x)\), \(f''(x)\), \(f'''(x)\), and \(f^{(4)}(x)\). Graph \(f\), \(f'\), \(f''\), and \(f'''\) on a common screen. Are the graphs consistent with the geometric interpretations of these derivatives?
56 Derivatives - Applications · Level 4
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(a) The graph of a position function of a car is shown, where \(s\) is measured in feet and \(t\) in seconds. Use it to graph the velocity and acceleration of the car. What is the acceleration at \(t = 10\) seconds?
(b) Use the acceleration curve from part (a) to estimate the jerk at \(t = 10\) seconds. What are the units for jerk?

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57 Derivatives - Differentiability · Level 4
Let \(f(x) = \sqrt[3]{x}\).
(a) If \(a \neq 0\), use Equation 2.7.5 to find \(f'(a)\).
(b) Show that \(f'(0)\) does not exist.
(c) Show that \(y = \sqrt[3]{x}\) has a vertical tangent line at \((0, 0)\). (Recall the shape of the graph of \(f\). See Figure 1.2.13.)

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58 Derivatives - Differentiability · Level 4
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(a) If \(g(x) = x^{\dfrac{2}{3}}\), show that \(g'(0)\) does not exist.
(b) If \(a \neq 0\), find \(g'(a)\).
(c) Show that \(y = x^{\dfrac{2}{3}}\) has a vertical tangent line at \((0, 0)\).

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59 Derivatives - Differentiability · Level 4
Show that the function \(f(x) = |x - 6|\) is not differentiable at 6. Find a formula for \(f'\) and sketch its graph.
60 Derivatives - Differentiability · Level 4
Where is the greatest integer function \(f(x) = \lfloor x \rfloor\) not differentiable? Find a formula for \(f'\) and sketch its graph.
61 Derivatives - Differentiability · Level 4
(a) Sketch the graph of the function \(f(x) = x |x|\).
(b) For what values of \(x\) is \(f\) differentiable?
(c) Find a formula for \(f'\).

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62 Derivatives - Differentiability · Level 4
(a) Sketch the graph of the function \(g(x) = x + |x|\).
(b) For what values of \(x\) is \(g\) differentiable?
(c) Find a formula for \(g'\).

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63 Derivatives - Proof · Level 5
Recall that a function \(f\) is called even if \(f(-x) = f(x)\) for all \(x\) in its domain and odd if \(f(-x) = -f(x)\) for all such \(x\). Prove each of the following.
(a) The derivative of an even function is an odd function.
(b) The derivative of an odd function is an even function.

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