1.

Letalpha, betabe suchpi lt alpha- betalt 3 piifsinalpha + sin beta = (-21)/(65) , andcosalphaCos beta= (-27)/(65) then the valueofcos( alpha - beta)/(2) is

Answer»

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

ANSWER :C


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