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If int cos^(-1)x+cos^(-1)sqrt(1-x^2) dx=...

If `int cos^(-1)x+cos^(-1)sqrt(1-x^2) dx= Ax+f(x)sin^(-1)x-2sqrt(1-x^2)+c` then

A

`f(x)=x`

B

`f(x)=-2x`

C

`A=(pi)/(4)`

D

`A=(pi)/(2)`

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