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Prove that cos 2x cos "" x/2 -cos 3x ...

Prove that
` cos 2x cos "" x/2 -cos 3x cos " (9x)/(2) = sin 5x sin ""(5x)/(2).`

Text Solution

Verified by Experts

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