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

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

A

`(2)/(x+1)`

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
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