1.

Sin x + sin 3x + sin 5x + sin 7x ÷cos x + cos 3x + cos 5x+cos 7x = tan 4x

Answer»

Answer:

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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