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If alpha + beta + gamma = 2 theta , " t...

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

A

`4sin ""(alpha )/(2).cos""(beta)/(2).sin""(gamma)/(2)`

B

`4 cos ""(alpha)/(2).cos""(beta)/(2).cos""(gamma)/(2)`

C

`4 sin ""alpha /2.sin""beta/2.sin""gamma2`

D

`3 sin alpha.sinbeta.singamma`

Text Solution

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The correct Answer is:
B
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