已知f(x)为定义在【-π/2,π/2】上的偶函数,当x∈【0,π/2】时,f(x)=2cosx-3sinx设a=f(cos1),b=f(cos2),c=f(cos3),则a,b,c的大小关系为?求详细过程
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![已知f(x)为定义在【-π/2,π/2】上的偶函数,当x∈【0,π/2】时,f(x)=2cosx-3sinx设a=f(cos1),b=f(cos2),c=f(cos3),则a,b,c的大小关系为?求详细过程](/uploads/image/z/12954355-43-5.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%E4%B8%BA%E5%AE%9A%E4%B9%89%E5%9C%A8%E3%80%90-%CF%80%2F2%2C%CF%80%2F2%E3%80%91%E4%B8%8A%E7%9A%84%E5%81%B6%E5%87%BD%E6%95%B0%2C%E5%BD%93x%E2%88%88%E3%80%900%2C%CF%80%2F2%E3%80%91%E6%97%B6%2Cf%28x%29%3D2cosx-3sinx%E8%AE%BEa%3Df%EF%BC%88cos1%EF%BC%89%2Cb%3Df%EF%BC%88cos2%EF%BC%89%2Cc%3Df%EF%BC%88cos3%EF%BC%89%2C%E5%88%99a%2Cb%2Cc%E7%9A%84%E5%A4%A7%E5%B0%8F%E5%85%B3%E7%B3%BB%E4%B8%BA%3F%E6%B1%82%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B)
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