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cos^(2)""(3pi)/(5)+cos^(2)""(4pi)/(5)=...

`cos^(2)""(3pi)/(5)+cos^(2)""(4pi)/(5)=`

A

`4//5`

B

`5//2`

C

`5//4`

D

`3//4`

Text Solution

Verified by Experts

The correct Answer is:
D
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