5cos^(-1)((1-x^(2))/(1+x^(2)))+7sin^(-1)...

`5cos^(-1)((1-x^(2))/(1+x^(2)))+7sin^(-1)((2x)/(1+x^(2)))-4tan^(-1)((2x)/(1-x^(2)))-tan^(-1)x=5pi`, then x is equal to

A

3

B

`sqrt(3)`

C

`sqrt(2)`

D

`sqrt(2)`

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