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If cos (x-y) =-1, then the values of (co...

If `cos (x-y) =-1,` then the values of `(cos x+ cos y) and (sin x + sin y)` are respectively-

A

`1,0`

B

`0,1`

C

`1,1`

D

`0,0`

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The correct Answer is:
D
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