1.

If cos (x-y)=-1,then cosx+cosy​

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Answer -1))) 0

Explaination ⤵⤵⤵

cosx-y=-1

⇒cosx-y=cosπ

⇒x-y=π

⇒x=π+y

Now,

cosx+cosy

-cosy+cosy

=0


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