Mathematics, 13.05.2021 14:00, luhmama

Let a, β, y be the three interior angles of any triangle, and try to prove that cos(a+β+y) = -1. $prove \: that \: \cos( \alpha + \beta + \gamma ) = - 1$

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Let a, β, y be the three interior angles of any triangle, and try to prove that cos(a+β+y) = -1.