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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

`cos "" alpha /2 cos "" beta /2 cos ""gamma/2`

C

`4 sin "" alhpe /2 sin "" beta/2 sin "" gamma/2`

D

`sin alpha sin beta sin gamma `

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The correct Answer is:
B
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