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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

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

D

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

Text Solution

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The correct Answer is:
D
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