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If alpha + beta - gamma =pi, then sin ^(...

If `alpha + beta - gamma =pi,` then `sin ^(2) alpha + sin^(2) beta- sin ^(2) gamma=`

A

` 2 sin alpha sin beta cos gamma`

B

` 2 cos alpha cos beta cos gamma `

C

`2 sin alpha sin beta sin gamma`

D

None of these

Text Solution

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The correct Answer is:
A
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