1.

Ifalpha + beta + gamma = 2 theta , " then " cos theta+ cos ( theta - alpha ) + cos (theta - beta ) + cos ( theta - gamma ) =

Answer»

`4SIN ""(alpha )/(2).cos""(beta)/(2).SIN""(gamma)/(2)`
`4 cos ""(alpha)/(2).cos""(beta)/(2).cos""(gamma)/(2)`
`4 sin ""alpha /2.sin""beta/2.sin""gamma2`
`3 sin alpha.sinbeta.singamma`

ANSWER :B


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