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If cos x.cos y + sin x.sin y = -1 then c...

If cos x.cos y + sin x.sin y = -1 then cos x + cos y is
यदि cos x.cos y + sin x.sin y = -1 हो, तो cos x + cos y का मान क्या होगा?

A

`-2`

B

1

C

0

D

2

Text Solution

Verified by Experts

The correct Answer is:
C
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