Answer :


Ideas required to solve the problem:


The general solution of any trigonometric equation is given as –


• sin x = sin y, implies x = nπ + (– 1)ny, where n Z.


• cos x = cos y, implies x = 2nπ ± y, where n Z.


• tan x = tan y, implies x = nπ + y, where n Z.


given,



In all such problems we try to reduce the equation in an equation involving single trigonometric expression.



{ }


{ cos A cos B + sin A sin B = cos (A - B)}



If cos x = cos y, implies x = 2nπ ± y, where n Z





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