If alpha + beta + gamma=pi, then the va...

If `alpha + beta + gamma=pi, ` then the value of `sin ^(2) alpha + sin ^(2) beta - sin^(2) gamma ` is equal to ....... A) `2 sin alpha ` B) `2 sin alpha cos beta sin gamma` C) `2 sin alpha sin beta cos gamma` D) `2 sin alpha sin beta sin gamma`

A

`2sinalpha`

B

`2sinalphacosbetasingamma`

C

`2sinalphasinbetacosgamma`

D

`2sinalphasinbetasingamma`

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