Problem 70
Calculate the derivative of the following functions.
y = e^2x(2x-7)⁵
Problem 70a
The following equations implicitly define one or more functions.
a. Find dy/dx using implicit differentiation.
y² = x²(4 − x) / 4 + x (right strophoid)
Problem 70b
The following equations implicitly define one or more functions.
b. Solve the given equation for y to identify the implicitly defined functions y=f₁(x), y = f₂(x), ….
y² = x²(4 − x) / 4 + x (right strophoid)
Problem 70c
The following equations implicitly define one or more functions.
c. Use the functions found in part (b) to graph the given equation.
y² = x²(4 − x) / 4 + x (right strophoid)
Problem 71
Find f′(x), f′′(x), and f′′′(x) for the following functions.
f(x) = (x2 - 7x - 8) / (x + 1)
Problem 71b
The right-sided and left-sided derivatives of a function at a point are given by and , respectively, provided these limits exist. The derivative exists if and only if .
Compute and at the given point .
;
Problem 72
First and second derivatives Find f′(x),f′′(x).
f(x) = x/x+2
Problem 72b
The right-sided and left-sided derivatives of a function at a point are given by and , respectively, provided these limits exist. The derivative exists if and only if .
Compute and at the given point .
;
Problem 73
Calculate the derivative of the following functions.
y = (p+3)² sin p²
Problem 73a
Find an equation of the line tangent to the following curves at the given value of x.
y = 1+2 sin x; x = π/6
Problem 74a
Suppose f(3) = 1 and f′(3) = 4. Let g(x) = x2 + f(x) and h(x) = 3f(x).
Find an equation of the line tangent to y = g(x) at x = 3.
Problem 74b
Tangent lines Suppose f(2)=2 and f′(2) =3. Let g(x) = x²f(x) and h(x) = f(x) / x−3.
b. Find an equation of the line tangent to y = h(x) at x=2.
Problem 75
27–76. Calculate the derivative of the following functions.
y = √f(x), where f is differentiable and nonnegative at x.
Problem 75a
{Use of Tech} The Witch of Agnesi The graph of y = a3 / (x2 + a2) , where a is a constant, is called the witch of Agnesi (named after the 18th-century Italian mathematician Maria Agnesi).
Let a = 3 and find an equation of the line tangent to y = 27 / (x2 + 9) at x = 2.
Problem 75b
{Use of Tech} The Witch of Agnesi The graph of y = a³ / x²+a² , where a is a constant, is called the witch of Agnesi (named after the 18th-century Italian mathematician Maria Agnesi).
b. Plot the function and the tangent line found in part (a).
Problem 76
Derivatives from a table Use the following table to find the given derivatives. <IMAGE>
d/dx (f(x)g(x)) |x=1
Problem 77a
Graph the function .
Problem 77b
For x < 0, what is f′(x)?
Problem 77c
For x > 0, what is f′(x)?
Problem 78
Derivatives from a graph Let F = f + g and G = 3f - g, where the graphs of f and g are shown in the figure. Find the following derivatives. <IMAGE>
F'(2)
Problem 79
Derivatives from a graph Let F = f + g and G = 3f - g, where the graphs of f and g are shown in the figure. Find the following derivatives.
<IMAGE>
G'(2)
Problem 80
Derivatives from a table Use the following table to find the given derivatives. <IMAGE>
d/dx (xf(x) / g(x)) |x=4
Problem 82
{Use of Tech} Cell population The population of a culture of cells after t days is approximated by the function P(t)=1600 / 1 + 7e^−0.02t, for t≥0.
a. Graph the population function.
Problem 82a
The following limits represent f'(a) for some function f and some real number a.
Find a possible function f and number a.
lim x🠂0 e^x-1 / x
Problem 82b
The following limits represent f'(a) for some function f and some real number a.
b. Evaluate the limit by computing f'(a).
lim x🠂0 e^x-1 / x
Problem 82e
{Use of Tech} Cell population The population of a culture of cells after t days is approximated by the function P(t)=1600 / 1 + 7e^−0.02t, for t≥0.
e. Graph the growth rate. When is it a maximum and what is the population at the time that the growth rate is a maximum?
Problem 84a
Use the given graphs of f and g to find each derivative. <IMAGE>
d/dx (5f(x)+3g(x)) |x=1
Problem 84b
The following limits represent f'(a) for some function f and some real number a.
b. Evaluate the limit by computing f'(a).
lim x🠂1 x¹⁰⁰-1 / x-1
Problem 84d
Use the given graphs of f and g to find each derivative. <IMAGE>
d/dx (f(f(x))) |x=4
Problem 84e
Use the given graphs of f and g to find each derivative. <IMAGE>
d/dx (g(f(x))) |x=1
Ch. 3 - Derivatives
