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题目 已知m为实数,x,y>0,x+y<π,求证:m(m-1)sin(x+y)+m(sinx-siny)+siny>0。
Title Known that m is a real number, x, y> 0, x + y <π, verify: m (m-1) sin (x + y) + m (sinx-siny) + siny> 0.