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Prove that, cos2xcos""(x)/(2)-cos3xcos...

Prove that,
`cos2xcos""(x)/(2)-cos3xcos""(9x)/(2)=sin5xsin""(5x)/(2)`.

Text Solution

Verified by Experts

The correct Answer is:
`sin " (5x)/(2)=R.H.S.`
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