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If f(x)=cos^(-1)1/(sqrt(13))(2cosx-3sinx...

If `f(x)=cos^(-1)1/(sqrt(13))(2cosx-3sinx)` `+sin^(-1)1/(sqrt(13))x(2cosx+3sinx)wdotrdottsqrt(1+x^2),` then find `(df(x))/(dx)` at `x=3/4dot`

A

`(3)/(2)`

B

`(5)/(2)`

C

`(10)/(3)`

D

0

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The correct Answer is:
C
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