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If f(x) = cos^(-1) ((2 cos x + 3 sin x)/...

If `f(x) = cos^(-1) ((2 cos x + 3 sin x)/( sqrt(13) ) )`, then `[f' (x)]^2` is equal to a)`sqrt(1+x)` b)`1+2x` c)`2` d)`1`

A

`sqrt(1+x)`

B

`1+2x`

C

`2`

D

`1`

Text Solution

Verified by Experts

The correct Answer is:
D
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