If y= tan ^(-1) ((a cos x- b sin x )/(...

If ` y= tan ^(-1) ((a cos x- b sin x )/(b cos x + a sin x ) )` ,
then ` (dy)/(dx)` is :

A

` 2`

B

` -1`

C

` 0`

D

` (b)/(a)`

Verified by Experts

The correct Answer is:

B

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