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Prove that cosθ cosθ/2 - cos3θ cos9θ/2 = sin 7θ sin 8θ
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Mar 1, 2019
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Class 11
by
kratos
Prove that cosθ cosθ/2 - cos3θ cos9θ/2 = sin 7θ sin 8θ
trigonometry function
class-11
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answered
Aug 27, 2020
by
kratos
Best answer
L.H.*. = cosθ cosθ/2 - cos3θ cos9θ/2
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