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Find the value of cos^(2)72^(@) - sin^(2...

Find the value of `cos^(2)72^(@) - sin^(2) 54^(@)`.

A

`sqrt5/4`

B

`-sqrt5/4`

C

`1/4`

D

`-1/4`

Text Solution

Verified by Experts

The correct Answer is:
B
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