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If sin alpha = sin beta and cos alpha ...

If `sin alpha = sin beta and cos alpha = cos beta ` then

A

`sin""((alpha + beta )/(2))=0`

B

`cos""((alpha + beta )/(2))=0`

C

`sin""((alpha- beta)/(2))=0`

D

`cos""((alpha- beta)/(2))=0`

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The correct Answer is:
C
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