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

If `sin alpha =sin beta and cos alpha = cos beta, ` then which obne of the following is correct ?

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
A
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