1.

The vlaue of sinx+siny=a and cos x+cosy=b then cos(x-y)=

Answer»

`(a^(2)+B^(2)+2)/2`
`(a^(2)-b^(2)+2)/2`
`(a^(2)+b^(2)-2)/2`
`(b^(2)-a^(2)+2)/2`

ANSWER :C


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