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If alpha+beta-gamma=pi, then sin^2alpha+...

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

A

`2sinalphasinbetacosgamma`

B

`2cosalphacosbetacosgamma`

C

`2sinalphasinbetasingamma`

D

none of these

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