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(d)/(dx) (cos (sec^(-1) ((x)/(8)))=...

`(d)/(dx) (cos (sec^(-1) ((x)/(8)))=`

A

` (8)/( x^(2))`

B

` (-8)/( x^(2))`

C

` (1)/( 8)`

D

` (-1)/( 8)`

Text Solution

Verified by Experts

The correct Answer is:
B
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