Question

3.
Derivative of cos √x
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Answer 1

Answer: -sin(√x).(1/2√x) .

Explanation:

d/DC(√x ) = d/dx ( x^1/2).= 1/2.x^1/2-1=1/2.x^1/2-2/2=1/2.x^-1/2=1/2x^1/2=1/2√x.

d/dx( cos(√x) )= - sin(√x) . d/dx(√x)

= -sin(√x) . (1/2√x).

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