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Prove - cos(π/7)cos(4π/7)cos(5π\\7) =1/8

Answer» Answer:Step-by-step explanation:According to this questionGiven thatFormula, sin 2x = 2 sinx cosxcosx =\xa0So,\xa0=\xa0\xa0=\xa0\xa0=\xa0\xa0=\xa0


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