Math 121 Final December 10, 2019
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Math 121 Final
December 10, 2019
1. (10 points)
(a) Find the equation of the line through (4, _1) and perpendicular to the line 2x + 4y = 5
(b) Find the inverse of the function f (x) =
2. (10 points)
1 _ x
x→ 1+ 1 _ x _ |1 _ x| .
θ _ tan θ
θ →0 sin θ .
3. (10 points) For f (x) = ^2 _ x
(a) Use the definition of derivative to find f\ (x).
(b) Find the equation of the tangent line to f (x) at x = 1.
4. (10 points) Find the derivatives of the following functions: (a) p(x) = (x2 + 3x) /x4/3 + 、
(b) q(x) =
5. (10 points)
(a) Let f (0) = 0 and f\ (0) = 2. Find the derivative of f (f (f (x))) at x = 0
(b) Find for y = x2 ecos x
6. (10 points) For
12(x2 + y ) = 25xy2
(a) Find dy
(b) Find the equation of the tangent line to the curve that goes through the point (3,4).
7. (10 points) Find f\ (2) if g(2) = T, g\ (2) = 5, h(2) = 3, h\ (2) = _2, and
(a) f (x) = g(x)x
(b) f (x) = arcsin(x _ 2)
8. (10 points) An observer watches a rocket launch from a distance of
6 kilometers. The angle of elevation θ is increasing at 2 radians per second at the instant when θ = . How fast is the rocket climbing at that instant?
9. (10 points) Find the dimensions of the rectangle with the largest pos- sible perimeter that can be inscribed in a semicircle of radius 1.
X X
10. (10 points) Based on the following information, answer all questions about the function f which is defined for all x.
f\ (x) = f\\ (x) =
x f (x)
0
-1
0
(a) x-intercepts:
(b) y-intercepts:
(c) Where f is increasing:
(d) Where f is decreasing:
(e) Critical points:
(f) Where f is concave up:
(g) Where f is concave down:
(h) The x coordinate of
any inflection points:
11. (10 points) Find the following limits:
x _ sin x
x→0 x3
(b)x(l) x sin / 、
(c)x(l) x sin / 、
12. (10 points) We know the following about g(x):
x |
1 |
2 |
3 |
4 |
5 |
g(x) |
2 |
3 |
7 |
5 |
_1 |
g ′ (x) |
_4 |
_3 |
9 |
15 |
16 |
(a) Find g(2.1) using a linear approximation.
(b) If you were using Newton’s method to find where g(x) = 0 starting at x1 = 2, what is x2 ?
13. (10 points)
(a) If f (x) and g(x) are continuous on [a, b] and f (x) 2 g(x) which of the following statements are always true:
b b b
I. (f (x) + g(x)) dx = f (x) dx + g(x) dx a a a
b b b
II. (f (x) . g(x)) dx = f (x) dx . g(x) dx a a a
b b
III. f (x) dx 2 g(x) dx a a
(a) I only (b) II only (c) III only (d) I and II only (e) I and III only (f) II and III only (g) I, II, and III (h) none of these
0 4
(b) If f (x) dx = ln(a2 + 1) for all numbers a, find f (x) dx
a 3
14. (10 points)
(a) Compute ╱ 1ez ln(t)dt\
8
(b) Compute ^8x _ x2 dx
4
15. (10 points)
(a) Compute
(b) Compute
16. (10 points)
(a) Compute
2
(15x4 + 3x2 ) dx
1
(ex + sec2 (3x)) dx.
8
^2x + 9 dx
0
π/2
(b) Compute sin x cos3 x dx
0
17. (10 points)
(a) Find the area of the region bounded by f (x) = and the
y-axis, for 0 < x < 1.
(b) Find average value of f (x) = for 0 < x < 1.
18. (10 points) Find the volume of the solid with base is the semicircle y = ^9 _ x2 _ 3 < x < 3
The cross sections perpendicular to the x-axis are squares.
19. (10 points) Find the volume of the solid that results when the area of the region enclosed by y = 2x, x = 0, and y = 2 is revolved about x = 1.
20. (10 points) A tank in the shape of a hemisphere with radius 10 ft is resting on its flat base with curved surface on top. It is filled with beer of density 40 lb/ft3 . How much work is done drinking all the beer through a hole in the top of the tank?
2022-12-11