Prove that limx → 0 x2 cos(1/x2) = 0.
> Evaluate | 2x – 1| – |2x + 1| lim
> Find numbers a and b such that Vax + b – 2 lim 1.
> Evaluate Vx - 1 lim
> Suppose f is a function that satisfies the equation f(x + y) = f(x) + f(y) + x2y + xy2 for all real numbers x and y. Suppose also that a. Find f(0). b. Find f’(0). c. Find f’(x). S(x) lim X-0 X 1
> If f is a differentiable function and g(x) = xf(x), use the definition of a derivative to show that g’(x) = xf’(x) + f(x).
> a. If we start from 0° latitude and proceed in a westerly direction, we can let T(x) denote the temperature at the point x at any given time. Assuming that T is a continuous function of x, show that at any fixed time there are at least two diametrically
> If limx → a [f(x) + g(x)] = 2 and limx → a [f(x) – g(x)] = 1, find limx → a [f(x)g(x)].
> A fixed point of a function f is a number c in its domain such that f(c) = c. (The function doesn’t move c; it stays fixed.) a. Sketch the graph of a continuous function with domain [0, 1] whose range also lies in [0, 1]. Locate a fixed point of f. b.
> Find all values of a such that f is continuous on R: x + 1 if x< a x² S(x) = if x>a
> Graph the function f(x) = sin(π/x) of Example 4 in the viewing rectangle [-1, 1] by [-1, 1]. Then zoom in toward the origin several times. Comment on the behavior of this function.
> Sketch the region in the plane defined by each of the following equations. (a) [x]? + [[y]² = 1 (c) [x + y]? = 1 (b) [x]? – [y]? = 3 (d) [x] + [y] = 1
> Find the limit. x² – 9 lim -3 x? + 2x – 3
> Find the limit. lim e31 K.
> Sketch the graph of a function f that satisfies all of the following conditions: f is continuous from the right at 3 lim f(x) = -2, lim f(x) = 0, lim f(x) = ∞, X-3 lim f(x) = -0∞, X3- lim f(x) = 2, X→3+
> The graph of f is given. a. Find each limit, or explain why it does not exist. b. State the equations of the horizontal asymptotes. c. State the equations of the vertical asymptotes. d. At what numbers is f discontinuous? Explain. (i) lim f(x)
> Let a. For what values of a does limx→a f(x) exist? b. At what numbers is f discontinuous? f(x) = [x] + [-x].
> Suppose that |f(x)|≤ g(x) for all x, where limx→a g(x) = 0. Find limx→a f(x).
> The total fertility rate at time t, denoted by F(t), is an estimate of the average number of children born to each woman (assuming that current birth rates remain constant). The graph of the total fertility rate in the United States shows the fluctuation
> Let B(t) be the number of US $20 bills in circulation at time t. The table gives values of this function from 1990 to 2010, as of December 31, in billions. Interpret and estimate the value of B’(2000). 1990 1995 2000 2005 2010 B(t)
> Let P(t) be the percentage of Americans under the age of 18 at time t. The table gives values of this function in census years from 1950 to 2010. a. What is the meaning of P’(t)? What are its units? b. Construct a table of estimated
> a. Evaluate h(x) = (tan x - x)/x3 for x = 1, 0.5, 0.1, 0.05, 0.01, and 0.005. b. Guess the value of c. Evaluate h(x) for successively smaller values of x until you finally reach a value of 0 for h(x). Are you still confident that your guess in part (b)
> If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet t seconds later is given by y = 40t - 16t2. a. Find the average velocity for the time period beginning when t = 2 and lasting i. 0.5 seconds ii. 0.1 seconds iii. 0.05 sec
> Sketch the graph of a function f that satisfies all of the following conditions: The domain of f is all real numbers except 0, / for all x in the domain of f/
> The figure shows the graphs of f, f’, and f’’. Identify each curve, and explain your choices. y. a b
> The graph of f is shown. State, with reasons, the numbers at which f is not differentiable. y 2 4 6.
> a. Find the asymptotes of the graph of f(x) = 4 – x/3 + x and use them to sketch the graph. b. Use your graph from part (a) to sketch the graph of f’. c. Use the definition of a derivative to find f’(x). d. Use a graphing device to graph f’ and compa
> a. If f(x) = 3− 5x , use the definition of a derivative to find f9sxd. b. Find the domains of f and f’. c. Graph f and f’ on a common screen. Compare the graphs to see whether your answer to part (a) is reasonable.
> Trace or copy the graph of the function. Then sketch a graph of its derivative directly beneath.
> Trace or copy the graph of the function. Then sketch a graph of its derivative directly beneath. yA
> Trace or copy the graph of the function. Then sketch a graph of its derivative directly beneath. yA
> The total cost of repaying a student loan at an interest rate of r% per year is C = f(r). a. What is the meaning of the derivative f’(r)? What are its units? b. What does the statement f’(10) = 1200 mean? c. Is f’(r) always positive or does it change s
> Find a function f and a number a such that (2 + h)* – 64 lim = f'(a) h
> a. Evaluate the function f(x) = x2 – (2x/1000) for x = 1, 0.8, 0.6, 0.4, 0.2, 0.1, and 0.05, and guess the value of b. Evaluate f(x) for x = 0.04, 0.02, 0.01, 0.005, 0.003, and 0.001. Guess again. 2* lim x² 1000
> a. Use the definition of a derivative to find f’(2), where f(x) = x3 - 2x. b. Find an equation of the tangent line to the curve y = x3 - 2x at the point (2, 4). c. Illustrate part (b) by graphing the curve and the tangent line on the same screen.
> According to Boyle’s Law, if the temperature of a confined gas is held fixed, then the product of the pressure P and the volume V is a constant. Suppose that, for a certain gas, PV = 800, where P is measured in pounds per square inch and V is measured in
> The displacement (in meters) of an object moving in a straight line is given by s = 1 + 2t + 1/4t2, where t is measured in seconds. a. Find the average velocity over each time period. i. [1, 3] ii. [1, 2] iii. [1, 1.5] iv. [1, 1.1] b. Find the i
> Find equations of the tangent lines to the curve y = 2/ 1 - 3x at the points with x-coordinates 0 and -1.
> a. Find the slope of the tangent line to the curve y = 9 - 2x2 at the point (2, 1). b. Find an equation of this tangent line.
> Use the Intermediate Value Theorem to show that there is a root of the equation in the given interval. cos√x = ex - 2, (0, 1)
> Use the Intermediate Value Theorem to show that there is a root of the equation in the given interval. x5 - x3 + 3x - 5 = 0, (1, 2)
> Show that the function is continuous on its domain. State the domain. g(x) = x2 – 9 /x2 - 2
> Show that the function is continuous on its domain. State the domain. h(x) = xesinx
> Let a. For each of the numbers 2, 3, and 4, discover whether g is continuous from the left, continuous from the right, or continuous at the number. b. Sketch the graph of g. 2х — х2 if 0 <x<2 2 — х if 2<x<3 g(x) · х — 4 if 3<x< 4 IT if x>4
> a. Graph the function f(x) = ex + ln|x - 4| for 0 ≤ x ≤ 5. Do you think the graph is an accurate representation off ? b. How would you get a graph that represents f better?
> Let a. Evaluate each limit, if it exists. b. Where is f discontinuous? c. Sketch the graph of f. if x<0 fx) — { 3 — х if 0 <x<3 (х — 3)? if x >3 (i) lim f(x) (ii) lim f(x) (iii) lim f(x) (iv) lim f(x) (v) lim f(x) (vi) lim f(x)
> Prove the statement using the precise definition of a limit. 2 lim 'x – 4 00
> Prove the statement using the precise definition of a limit. lim (x? — Зx) —-2
> Prove the statement using the precise definition of a limit. lim Vx = 0 %3D
> Prove the statement using the precise definition of a limit. lim (14 – 5x) = 4
> If 2x - 1 ≤ f(x) ≤ x2 for 0 < x < 3, find limx →1 f(x).
> Use graphs to discover the asymptotes of the curve. Then prove what you have discovered. y = x2 + x + 1 - x2 − x
> Use graphs to discover the asymptotes of the curve. Then prove what you have discovered. y = cos2x/x2
> Find the limit. 1 lim - 1 x? — Зх + 2
> a. Estimate the value of the limit limx→0 (1 + x)1/x to five decimal places. Does this number look familiar? b. Illustrate part (a) by graphing the function y = (1 + x)1/x.
> Find the limit. lim tan '(1/x)
> Find the limit. lim er
> Find the limit. lim (Vr2 + 4x +1– x)
> Find the limit. 1— 2х2 — х4 lim x 5 + r – 3x x*
> Find the limit. lim In(sin x)
> Find the limit. Vx2 – 9 lim 2x – 6
> Find the limit. Vx² - 9 lim x 2x - 6
> Find the limit. Vx + 6 – x lim x³ – 3x²
> Find the limit. - 1 u + 5u? — би и^ — 1 lim ,3
> Find the limit. 4 - v lim 4+ |4 – v|
> a. By graphing the function f(x) = (tan4x)/x and zooming in toward the point where the graph crosses the y-axis, estimate the value of limx→0 f(x). b. Check your answer in part (a) by evaluating f(x) for values of x that approach 0.
> Find the limit. lim 9 (r – 9)*
> Find the limit. 12 – 4 lim .3 - 8 →2
> Find the limit. (h – 1)' + 1 lim h
> Find the limit. x² – 9 lim I1t x + 2x - 3 .2
> Find the limit. x? – 9 lim .2 x-3 x + 2x - 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. у.
> Match the graph of each function in (a)–(d) with the graph of its derivative in I–IV. Give reasons for your choices. (а) y. (b) (с) yA (d) yA I y4 II II IV
> Use the given graph to estimate the value of each derivative. Then sketch the graph of f’. a. f’(0) b. f’(1) c. f’(2) d. f’(3) e. f’(4) f. f&a
> Use the given graph to estimate the value of each derivative. Then sketch the graph of f’. a. f’ (-3) b. f’(-2) c. f’(-1) d. f’(0) e. f’(1) f
> Let ℓ be the tangent line to the parabola y = x2 at the point (1, 1). The angle of inclination of l is the angle ϕ that ℓ makes with the positive direction of the x-axis. Calculate ϕ correct to the nearest degree.
> Determine a. by evaluating f(x) = 1/(x3 – 1) for values of x that approach 1 from the left and from the right, b. by reasoning as in Example 9, and c. from a graph of f. 1 1 lim .3 x→1 x - 1 · and lim x→1+ x - 1
> When you turn on a hot-water faucet, the temperature T of the water depends on how long the water has been running. a. Sketch a possible graph of T as a function of the time t that has elapsed since the faucet was turned on. b. Describe how the rate of
> Nick starts jogging and runs faster and faster for 3 minutes, then he walks for 5 minutes. He stops at an intersection for 2 minutes, runs fairly quickly for 5 minutes, then walks for 4 minutes. a. Sketch a possible graph of the distance s Nick has cov
> The left-hand and right-hand derivatives off at a are defined by if these limits exist. Then f’(a) exists if and only if these one-sided derivatives exist and are equal. a. Find f’-(4) and f’+(4) f
> 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 e
> 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’.
> 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’.
> Where is the greatest integer function f(x) = [[x]] not differentiable? Find a formula for f’ and sketch its graph.
> Show that the function f(x) =|x = 6| is not differentiable at 6. Find a formula for f’ and sketch its graph.
> a. If g(x) = x2/3, show that g’(0) does not exist. b. If a ≠ 0, find g’(a). c. Show that y = x2/3 has a vertical tangent line at (0, 0). d. Illustrate part (c) by graphing y = x2/3.
> Let f(x) = ∛x . a. If a ≠ 0, use Equation 2.7.5 to find f’(a). b. Show that f’(0) does not exist. c. Show that y = ∛x has a vertical tangent line at (0, 0). (Recall the shape of the graph of f. See Figure 1.2.13.)
> a. Find the vertical asymptotes of the function y = x2 + 1 / 3x - 2x2 b. Confirm your answer to part (a) by graphing the function.
> 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 est
> If f(x) = 2x2 - x3, 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?
> 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) = x3 - 3x
> 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) = 3x2 + 2x + 1
> 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. b
> 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. a b
> The figure shows graphs of f, f’, f’’, and f’’’. Identify each curve, and explain your choices. ab c d yA
> The figure shows the graphs of f, f’, and f’’. Identify each curve, and explain your choices. a b
> The graphs of a function f and its derivative f’ are shown. Which is bigger, f’(-1) or f’’(1)? y
> The graphs of a function f and its derivative f’ are shown. Which is bigger, f’(-1) or f’’(1)?
> Determine the infinite limit. lim (In x² – x-2)
> Zoom in toward the points (1, 0), (0, 1), and (-1, 0) on the graph of the function g(x) = (x2 – 1)2/3. What do you notice? Account for what you see in terms of the differentiability of g.
> 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 off?
