(d)/(dx){cos^(-1) ""(x-x^(-1))/(x+x^(-1)...

`(d)/(dx){cos^(-1) ""(x-x^(-1))/(x+x^(-1))}=`

A

`1/(1+x^2)`

B

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

C

`2/(1+x^2)`

D

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

Verified by Experts

The correct Answer is:

D

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