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Prove that: (1+ cos ""(pi)/(10)) (1+ cos...

Prove that: `(1+ cos ""(pi)/(10)) (1+ cos ""(3pi)/(10)) (1+ cos ""(7 pi)/(10)) (1+ cos""(9 pi)/(10))=(1)/(16)`

Text Solution

Verified by Experts

The correct Answer is:
`(1)/(16)`
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