已知sina,cosa为方程4x2-4mx+2m-1=0的两个实根,a属于(-π/2,0),求m和a
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![已知sina,cosa为方程4x2-4mx+2m-1=0的两个实根,a属于(-π/2,0),求m和a](/uploads/image/z/2491343-71-3.jpg?t=%E5%B7%B2%E7%9F%A5sina%2Ccosa%E4%B8%BA%E6%96%B9%E7%A8%8B4x2-4mx%2B2m-1%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%AE%9E%E6%A0%B9%2Ca%E5%B1%9E%E4%BA%8E%EF%BC%88-%CF%80%2F2%2C0%EF%BC%89%2C%E6%B1%82m%E5%92%8Ca)
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