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The value of cos36° cos42° cos78° is

+2 votes

asked Apr 7, 2019 in JEE by kratos

The value of cos36° cos42° cos78° is

trigonometrical identities
trigonometry
jee
class-10
icse
jee mains

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1 Answer

+1 vote

answered Feb 8, 2020 by kratos

Best answer

Correct option (b)

Explanation:

cos36°cos42°cos78°

= cos36°cos(60° – 18°)cos(60° + 18°)

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