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

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

A

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

B

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

C

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

D

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

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The correct Answer is:
A
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES -CRITICAL THINKING
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