已知向量a=(√3sin3x,-y),b=(m,cos3x-m)m属于R,且向量a+向量b=0向量.设y=f(x).求f(x)的表达式,并求函数f(x)在18分之π到9分之2π上图像最低点M的坐标.(2)求若对任意x属于0到9分之π,f(x)大于t-9x+1恒成
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![已知向量a=(√3sin3x,-y),b=(m,cos3x-m)m属于R,且向量a+向量b=0向量.设y=f(x).求f(x)的表达式,并求函数f(x)在18分之π到9分之2π上图像最低点M的坐标.(2)求若对任意x属于0到9分之π,f(x)大于t-9x+1恒成](/uploads/image/z/7042117-13-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%EF%BC%88%E2%88%9A3sin3x%2C-y%EF%BC%89%2Cb%3D%28m%2Ccos3x-m%29m%E5%B1%9E%E4%BA%8ER%2C%E4%B8%94%E5%90%91%E9%87%8Fa%2B%E5%90%91%E9%87%8Fb%3D0%E5%90%91%E9%87%8F.%E8%AE%BEy%3Df%28x%29.%E6%B1%82f%28x%29%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F%2C%E5%B9%B6%E6%B1%82%E5%87%BD%E6%95%B0f%28x%29%E5%9C%A818%E5%88%86%E4%B9%8B%CF%80%E5%88%B09%E5%88%86%E4%B9%8B2%CF%80%E4%B8%8A%E5%9B%BE%E5%83%8F%E6%9C%80%E4%BD%8E%E7%82%B9M%E7%9A%84%E5%9D%90%E6%A0%87.%EF%BC%882%EF%BC%89%E6%B1%82%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8Fx%E5%B1%9E%E4%BA%8E0%E5%88%B09%E5%88%86%E4%B9%8B%CF%80%2Cf%28x%29%E5%A4%A7%E4%BA%8Et-9x%2B1%E6%81%92%E6%88%90)
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