cos^2 4 5^(@)-sin^2 1 5^(@)=...............

`cos^2 4 5^(@)-sin^2 1 5^(@)=`................. A) `(sqrt3)/(2)` B) `(sqrt3)/(4)` C) `(sqrt3+1)/(2sqrt2)` D) `(sqrt3+1)/(2sqrt2)`

A

`(sqrt3)/(2)`

B

`(sqrt3)/(4)`

C

`(sqrt3+1)/(2sqrt2)`

D

`(sqrt3-1)/(2sqrt2)`

Verified by Experts

The correct Answer is:

B

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