a. Use the definition of the derivative and the identity sin(a + B) = sin(a) cos(B) + cos(a) sin(B) to prove that [sin(x)]' = cos(x). %3D

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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a. Use the definition of the derivative and the identity
sin(a + B) = sin(a) cos(8) + cos(a) sin(B) to prove that
[sin(x)]' = cos(x).
b. A man stands 35 metres from a helicopter sitting on a landing pad. The
helicopter begins rising into the air at a constant rate of 8 m/sec. At the same
time, the man begins to walk towards the landing pad at a constant rate of 1
m/sec. Determine the rate at which the distance between the man and the
helicopter is changing exactly 5 seconds after the helicopter launched.
c. A box is to be manufactured such that its length is exactly two times its width
and its volume is of a cubic metre. Assuming that the box is closed on all
1
sides, determine the smallest amount of material needed for its construction.
Transcribed Image Text:a. Use the definition of the derivative and the identity sin(a + B) = sin(a) cos(8) + cos(a) sin(B) to prove that [sin(x)]' = cos(x). b. A man stands 35 metres from a helicopter sitting on a landing pad. The helicopter begins rising into the air at a constant rate of 8 m/sec. At the same time, the man begins to walk towards the landing pad at a constant rate of 1 m/sec. Determine the rate at which the distance between the man and the helicopter is changing exactly 5 seconds after the helicopter launched. c. A box is to be manufactured such that its length is exactly two times its width and its volume is of a cubic metre. Assuming that the box is closed on all 1 sides, determine the smallest amount of material needed for its construction.
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