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If x = cos alpha + cos beta - cos(alpha...

If `x = cos alpha + cos beta - cos(alpha +beta)` and `y = 4 sin '(alpha)/(2) sin'(beta)/(2) cos((alpha+ beta)/(2))`, then `(x-y)` equals

A

0

B

1

C

-1

D

-2

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The correct Answer is:
A
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