\frac{\sin 5 x+\sin 3 x}{\cos 5 x+\cos 3 x}=\tan 4 x – InterviewSolution

1.	\frac{\sin 5 x+\sin 3 x}{\cos 5 x+\cos 3 x}=\tan 4 x
Answer» (sin5x+sin3x)/(cos5x+cos3x)=(2sin4xcosx)/(2cos4xcosx)=sin4x/cos4x=tan4x

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