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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

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

D

`4 sin alpha * sin beta * sin gamma `

Text Solution

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 E ( TRIGONOMETRIC IDENTITIES )
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