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If alpha + beta- gamma= pi, prove that ...

If `alpha + beta- gamma= pi`, prove that `sin^(2)alpha + sin^(2)beta - sin^(2)gamma = 2sin alpha sin beta cos 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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