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If f'(x)=k(cos x-sinx), f'(0)=3, f((pi)/...

If f'(x)=k(cos x-sinx), f'(0)=3, `f((pi)/(2))=15`, find f(x)

A

`cosx+sinx+12`

B

`3(cosx+sinx)+12`

C

`cosx+sinx-12`

D

`3(cosx+sinx)-12`

Text Solution

Verified by Experts

The correct Answer is:
B
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