1.

If (sinA+sinB=a) and (cosA+cosB=b) then the value of cos(A+B) is equal to

Answer»

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

ANSWER :C


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