Math, asked by riyakutlehria8258, 11 months ago

prove that: cosπ/7cos2π/7cos4π/7=-1/8

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Answered by sindhujaaj149

0

Formulae used: sin 2A = 2sinAcosA
Multiplied with 2/2 in step-2 and 3
2sinAcosB=sin(a+b) + sin(a-b)

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Answered by Uniquedosti00017

1

Answer:

see the attachment for the solution.

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