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d/(dx)(cos^-1((1-x^2)/(1+x^2)))=...

`d/(dx)(cos^-1((1-x^2)/(1+x^2)))=`

A

`sin^-1((1-x^2)/(1+x^2))`

B

`(2x)/(1+x^2)sin^-1((1-x^2)/(1+x^2))`

C

`2/(1+x^2)`

D

`1/(1+x^2)`.

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