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If cos (x-y)+1=0, then the value of (cos...

If `cos (x-y)+1=0,` then the value of `(cos x+ cos y) and (sin x+sin y)` is-

A

`0,0`

B

`1,0`

C

`0,1`

D

`1,1`

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The correct Answer is:
A
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