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(cos A+ cos B) ^(2) + (sin A-sin B) ^(2)...

`(cos A+ cos B) ^(2) + (sin A-sin B) ^(2)` is equal to

A

`4 cos ^(2) ((A-B)/(2))`

B

` 4 cos ^(2) ((A+B)/(2))`

C

` 4 sin ^(2) ((A-B)/(2))`

D

`4 sin ^(2) ((A+B)/(2))`

Text Solution

Verified by Experts

The correct Answer is:
B
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