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Step-by-step explanation:
1/2sinA (2sinA.cosA)cos2A.cos4A.cos8A
=(2.sin2A.cos2A).cos4A.cos8A/2.2sin A
=(2.sin4A.cos4A).cos8A/2.4sinA
=(2.sin8A.cos8A)/2.8sinA
=sin 16 A/16sinA
proved
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here is your answer please Mark brainliest
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