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Find the value of cos^(4)((pi)/(8))+co...

Find the value of
`cos^(4)((pi)/(8))+cos^(4)((3pi)/(8))+cos^(4)((5pi)/(8))+cos^(4)((7pi)/(8))`.

Text Solution

Verified by Experts

The correct Answer is:
`(3)/(2)`
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