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If alpha, beta, gamma are acute angles a...

If `alpha, beta, gamma` are acute angles and `cos theta = sin beta//sin alpha, cos phi = sin gamma//sin alpha` and `cos (theta-phi)= sin beta sin gamma`, then `tan^(2)alpha-tan^(2)beta-tan^(2) gamma` is equal to

A

-1

B

0

C

1

D

None of these

Text Solution

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The correct Answer is:
B
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