If $\alpha+\beta-\gamma=\pi$, show that $$\sin^2\alpha+\sin^2\beta-\sin^2\gamma=2\sin\alpha\sin\beta\cos\gamma$$ Please don't ask about ideas because I really don't have one. I was initially thinking about a triangle with the given angles... But no chance EDIT. Sorry guys, now is correct.
2026-04-11 17:45:25.1775929525
Sum of 3 angles
44 Views Asked by Bumbble Comm https://math.techqa.club/user/bumbble-comm/detail AtRelated Questions in TRIGONOMETRY
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