Simplify \tan ^{-1}\left[\frac{a \cos x-b \sin x}{b \cos x+a \sin x}\r – InterviewSolution

1.	Simplify \tan ^{-1}\left[\frac{a \cos x-b \sin x}{b \cos x+a \sin x}\right], \text { if } \frac{a}{b} \tan x>-1
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