sin x +sin 3x +sin 5x+sin 7x/ cos x+ cos 3x+ cos 5x+ cos 7x = tan 4x
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Given - sin x +sin 3x +sin 5x+sin 7x/ cos x+ cos 3x+ cos 5x+ cos 7x = tan 4x
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USE THE FORMULA..
sin c+sin d = 2sin(c+d)/2 × cos(c-d)/2
cos c+ cos d = 2cos(c+d)/2 × cos(c-d)/2
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