(cosA+cosB)^2+(sinA-sinB)^2 is equal to...

`(cosA+cosB)^2+(sinA-sinB)^2` is equal to

A

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

B

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

C

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

D

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

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