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cos^(2) 36^(@) + cos^(2) 72^(@)=...

`cos^(2) 36^(@) + cos^(2) 72^(@)=`

A

`1`

B

`2//3`

C

`-2//3`

D

`3//4`

Text Solution

Verified by Experts

The correct Answer is:
D
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