已知向量M=(2acosx,sinx),向量n=(cosx,bcosx),函数f(x)=向量m*向量n-根号3/2,函数f(x)的图像在y轴上的焦点坐标为(0,根号3/2),且f(x)=1/2(1)求f(x)的解析式以及单调递减区间(2)设A为三角形的一二内角
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![已知向量M=(2acosx,sinx),向量n=(cosx,bcosx),函数f(x)=向量m*向量n-根号3/2,函数f(x)的图像在y轴上的焦点坐标为(0,根号3/2),且f(x)=1/2(1)求f(x)的解析式以及单调递减区间(2)设A为三角形的一二内角](/uploads/image/z/2500685-53-5.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8FM%3D%EF%BC%882acosx%2Csinx%29%2C%E5%90%91%E9%87%8Fn%3D%EF%BC%88cosx%2Cbcosx%29%2C%E5%87%BD%E6%95%B0f%28x%29%3D%E5%90%91%E9%87%8Fm%2A%E5%90%91%E9%87%8Fn-%E6%A0%B9%E5%8F%B73%2F2%2C%E5%87%BD%E6%95%B0f%28x%29%E7%9A%84%E5%9B%BE%E5%83%8F%E5%9C%A8y%E8%BD%B4%E4%B8%8A%E7%9A%84%E7%84%A6%E7%82%B9%E5%9D%90%E6%A0%87%E4%B8%BA%EF%BC%880%2C%E6%A0%B9%E5%8F%B73%2F2%EF%BC%89%2C%E4%B8%94f%28x%29%3D1%2F2%281%29%E6%B1%82f%28x%29%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E4%BB%A5%E5%8F%8A%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B4%EF%BC%882%EF%BC%89%E8%AE%BEA%E4%B8%BA%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E4%B8%80%E4%BA%8C%E5%86%85%E8%A7%92)
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