已知 向量a=(sinx,2倍根号3 cosx),向量b=(2sinx,sinx),设f(x)=向量a*向量b-1(1)若x属于[0,派/2],求f(x)的值域.(2)若函数y=f(x)的图象关于直线x=a(a大于0)对称,求a的最小值.已知函数f(x)=cos2x/2-sinxcosx-sin
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![已知 向量a=(sinx,2倍根号3 cosx),向量b=(2sinx,sinx),设f(x)=向量a*向量b-1(1)若x属于[0,派/2],求f(x)的值域.(2)若函数y=f(x)的图象关于直线x=a(a大于0)对称,求a的最小值.已知函数f(x)=cos2x/2-sinxcosx-sin](/uploads/image/z/12534838-70-8.jpg?t=%E5%B7%B2%E7%9F%A5+%E5%90%91%E9%87%8Fa%3D%28sinx%2C2%E5%80%8D%E6%A0%B9%E5%8F%B73+cosx%29%2C%E5%90%91%E9%87%8Fb%3D%282sinx%2Csinx%29%2C%E8%AE%BEf%28x%29%3D%E5%90%91%E9%87%8Fa%2A%E5%90%91%E9%87%8Fb-1%EF%BC%881%EF%BC%89%E8%8B%A5x%E5%B1%9E%E4%BA%8E%5B0%2C%E6%B4%BE%2F2%5D%2C%E6%B1%82f%28x%29%E7%9A%84%E5%80%BC%E5%9F%9F.%EF%BC%882%EF%BC%89%E8%8B%A5%E5%87%BD%E6%95%B0y%3Df%28x%29%E7%9A%84%E5%9B%BE%E8%B1%A1%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BFx%3Da%EF%BC%88a%E5%A4%A7%E4%BA%8E0%EF%BC%89%E5%AF%B9%E7%A7%B0%2C%E6%B1%82a%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC.%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dcos2x%2F2-sinxcosx-sin)
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