Math, asked by jyotibindusingh, 9 months ago

prove that cos20.cos40.cos80=1/8

Answers

Answered by rudraverma2066

0

Answer:

cos 20 × cos 40 × cos 80

Multiply and divide by sin 20

(Formula used: "2 sin A cos A = sin 2A" or "sin A cos A = (sin 2A)/2 )

Step-by-step explanation:

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