differentiation

Question: If $y = {\tan ^{ - 1}}\left( {\frac{{a\cos x - b\sin x}}{{b\cos x + a\sin x}}} \right)$ then $\frac{{dy}}{{dx}} = $



1) 2
2) – 1
3) $\frac{a}{b}$
4) 0
Solution: Explanation: Explanation
standard-differentiation

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