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