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sin(beta+gamma-alpha)+sin(gamma+alpha-be...

`sin(beta+gamma-alpha)+sin(gamma+alpha-beta)+sin(alpha+beta-gamma)-sin(alpha+beta+gamma)=`

A

`2sinalpha sinbetasingamma`

B

`4sinalpha sinbetasingamma`

C

`8sinalpha sinbetasingamma`

D

`sinalpha sinbetasingamma`

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