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Prove that sin (theta)/(2) sin"" (7 thet...

Prove that sin `(theta)/(2) sin"" (7 theta)/(2) + sin ""(3theta)/(2) sin ""(11 theta)/(2) = sin 2theta sin5 theta`.

Text Solution

Verified by Experts

The correct Answer is:
`sin 5 theta sin 2 theta`
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