已知函数f(x)=asinx-bcosx(a、b为常数.a不等于0,x∈R)在x=π/4处取得最小值,则函数y=f(3π/4-x)是 ( )A.偶函数且它的图像关于点(π,0)对称B.偶函数且它的图像关于点(3π/2,0)对称C
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![已知函数f(x)=asinx-bcosx(a、b为常数.a不等于0,x∈R)在x=π/4处取得最小值,则函数y=f(3π/4-x)是 ( )A.偶函数且它的图像关于点(π,0)对称B.偶函数且它的图像关于点(3π/2,0)对称C](/uploads/image/z/6911738-26-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3Dasinx%EF%BC%8Dbcosx%EF%BC%88a%E3%80%81b%E4%B8%BA%E5%B8%B8%E6%95%B0.a%E4%B8%8D%E7%AD%89%E4%BA%8E0%2Cx%E2%88%88R%EF%BC%89%E5%9C%A8x%3D%CF%80%2F4%E5%A4%84%E5%8F%96%E5%BE%97%E6%9C%80%E5%B0%8F%E5%80%BC%2C%E5%88%99%E5%87%BD%E6%95%B0y%3Df%EF%BC%883%CF%80%2F4%EF%BC%8Dx%EF%BC%89%E6%98%AF+%EF%BC%88+%EF%BC%89A%EF%BC%8E%E5%81%B6%E5%87%BD%E6%95%B0%E4%B8%94%E5%AE%83%E7%9A%84%E5%9B%BE%E5%83%8F%E5%85%B3%E4%BA%8E%E7%82%B9%EF%BC%88%CF%80%2C0%EF%BC%89%E5%AF%B9%E7%A7%B0B%EF%BC%8E%E5%81%B6%E5%87%BD%E6%95%B0%E4%B8%94%E5%AE%83%E7%9A%84%E5%9B%BE%E5%83%8F%E5%85%B3%E4%BA%8E%E7%82%B9%EF%BC%883%CF%80%EF%BC%8F2%2C0%EF%BC%89%E5%AF%B9%E7%A7%B0C)
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