Verify the Given Identity $$\frac { \sin 5 x + \sin 3 x } { \cos 5 x + \cos 3 x } = \tan 4 x$$

question 102

Essay

Verify the given identity.
$$\frac { \sin 5 x + \sin 3 x } { \cos 5 x + \cos 3 x } = \tan 4 x$$

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