(1)a?b=2sin2x+1∈[1,3]; c?d=cos2x+2=3-2sin2x∈[1,3];（2）∵二次函数f(x)对任意x∈R,都有f(1-x）=f(1+x)成立，∴二次函数f(x)图像的对称轴为x=1,x∈[0,π]时,a?b=2sin2x+1∈[1,3];c?d=cos2x+2=3-2sin2x∈[1,3];开口向上时[1,3]上是增函数，f(a*b)>f(c*d)即a?b=2sin2x+1>c?d=cos2x+2=3-2sin2x,sinx>√2/ 2, ∴π/4<x<3π/4...
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