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(cosalpha+cosbeta)^2+(sinalpha+sinbeta)^...

`(cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2`=

A

`4sin^2((alpha+beta)/2)`

B

`4cos^2((alpha+beta)/2)`

C

`4sin^2((alpha-beta)/2)`

D

`4cos^2((alpha-beta)/2)`

Text Solution

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The correct Answer is:
D
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