1.

Let alpha, beta be such that pi lt alpha -beta lt 3 pi. If sin alpha + sin beta =- (21)/(65) and cos alpha + cos beta =- (27)/(65) andif the value of cos "" (alpha - beta)/(2) =(-a)/(sqrtb), then a xx b=

Answer»

`(-3)/(SQRT(130))`
`(3)/(sqrt(130))`
`(6)/(65)`
`(-6)/(65)`

ANSWER :A::C


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