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Prove that : cos40° cos80° cos160° = 1/8

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Prove that : cos40° cos80° cos160° = 1/8

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Take L.H.S,

cos 40° cos 80° cos 160° 

Multiplying & Dividing by 2 :

= \(\frac{1}{8}\)

= R.H.S 

Hence Proved.

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