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Simplify tan^(-1)[(acosx-bsinx)/(bcosx+a...

Simplify `tan^(-1)[(acosx-bsinx)/(bcosx+asinx)],` if `a/btanx >-1` .

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  18. Simplify tan^(-1)[(acosx-bsinx)/(bcosx+asinx)], if a/btanx >-1 .

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