Sin x + sin 3x + sin 5x + sin 7x ÷cos x + cos 3x + cos 5x+cos 7x = tan 4x
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Step-by-step explanation:
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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