If α,β,γ\alpha, \beta, \gammaα,β,γ are the angles of a triangle, what is the value of sin2α+sin2β−sin2γ\sin^2 \alpha + \sin^2 \beta - \sin^2 \gammasin2α+sin2β−sin2γ?
2sinαsinβcosγ2\sin \alpha \sin \beta \cos \gamma2sinαsinβcosγ
2sinαsinβsinγ2\sin \alpha \sin \beta \sin \gamma2sinαsinβsinγ
cosαcosβcosγ\cos \alpha \cos \beta \cos \gammacosαcosβcosγ
000