已知向量a=(cos3/2*x,sin3/2*x),b=(cosx/2,-sinx/2),且x属于【0,派/2】.若f(x)=a*b-2λ|a+b|的最小值是-3/2,求λ的值.
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![已知向量a=(cos3/2*x,sin3/2*x),b=(cosx/2,-sinx/2),且x属于【0,派/2】.若f(x)=a*b-2λ|a+b|的最小值是-3/2,求λ的值.](/uploads/image/z/3859495-7-5.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%EF%BC%88cos3%2F2%2Ax%2Csin3%2F2%2Ax%EF%BC%89%2Cb%3D%EF%BC%88cosx%2F2%2C-sinx%2F2%EF%BC%89%2C%E4%B8%94x%E5%B1%9E%E4%BA%8E%E3%80%900%2C%E6%B4%BE%2F2%E3%80%91.%E8%8B%A5f%EF%BC%88x%EF%BC%89%3Da%2Ab-2%CE%BB%7Ca%2Bb%7C%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF-3%2F2%2C%E6%B1%82%CE%BB%E7%9A%84%E5%80%BC.)
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