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`9*x^3-x*(1-x)^2`
`x*(2*x^3+x^2-3*x+1)`
`6/(x-1)-3/(x+1)`
`sqrt(18)`
`(x-y)^3`
`sqrt(4*x^4*9*y^2)`
`(x+y)^2`
`(x+y)^3`
`6*x^2+3*x`
`(x + y)^2`