$6x^4+7x^3-x$
$\ln\left(7x^2-2x^4\right)$
$\int_0^1\left(\frac{\cos\left(x\right)}{x^2}\right)dx$
$\frac{2}{1+\left(\frac{x}{3}\right)}$
$\frac{-x^2-2x+1}{x+1}$
$-\frac{1}{3}\left(15a-27b\right)$
$5y^2-2y^3-7y^2+4y^3$
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