If y="cot"^(-1)sqrt(1-cos3x)/sqrt(1+cos3...

If `y="cot"^(-1)sqrt(1-cos3x)/sqrt(1+cos3x)`, then dy/dx is

A

`3/((1+x^2))`

B

`-3/((1+x^2))`

C

`3/2`

D

`-3/2`

Verified by Experts

The correct Answer is:

D

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