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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

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

B

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

C

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

D

`3 sin alphasinbeta.sin gamma`

Text Solution

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The correct Answer is:
B
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