Approximation (a) Find lim x → 0 1 − cos x x 2 . (b) Use your answer to part (a) to device the approximation cos x ≈ 1 − 1 2 x 2 for x near 0. (c) Use your answer to part (b) to approximate cos(0.1). (d) Use a calculator to approximate cos(0.1) to four decimal places. Compare the result with part (c).
Approximation (a) Find lim x → 0 1 − cos x x 2 . (b) Use your answer to part (a) to device the approximation cos x ≈ 1 − 1 2 x 2 for x near 0. (c) Use your answer to part (b) to approximate cos(0.1). (d) Use a calculator to approximate cos(0.1) to four decimal places. Compare the result with part (c).
Solution Summary: The author explains the value of the limit undersetxto 0mathrmlim
As a wave passes by an offshore piling, the height of the water is modeled by the function
3 cos (+)
20
where h(t) is the height in feet above mean sea level at time t seconds.
h(t) = 3 cos
trough
crest
(a) Find the period of the wave.
s
(b) Find the wave height, that is, the vertical distance between the trough and the crest of the wave.
ft
F(x)=4.2*sin(1.7x+4.9)-2.9
Find x when F(x)=-6.2
Set calculator in radians and round answer to 3 decimal places
A rescued whale is released into the ocean 400 meters due east of a coast guard station. The whale swims directly away from the shore.
coast guard
station
point of
release
O tan(0)
(a) Which of the following equations can be used to relate the angle, 0, and the distance between the whale and the point of release, x?
O cos(0)
O sec(0) =
O sin(0)
=
O tan(0)
=
X
400
X
400
X
400
O cos² (0)-
X
400
400
X
O sec² (8) de
dt
de
dt
(b) Which of the following would be an appropriate related rate equation for the answer to part (a)?
1 dx
400 dt
=
O sec² (0) dx
dt
O sec(0)tan(0)-
O cos²(e) de
dt
=
=
8
1 dx
400 dt
de 1 dx
dt 400 dt
=
dx
dt
X
whale
1 de
400 dt
(c) If the whale swims at a constant rate of 60 meters per minute, how fast is the angle changing when the whale is 300 meters from the point of release? Give an exact answer.
radians per minute
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