$\frac{\left(2x^2y^{-3}\right)}{\left(x^2y^{-1}\right)^{-2}}$
$7x^2-5x+4$
$\int_{-1}^23^{2x}dx$
$\int_1^3\left(\frac{x+12}{x^2\left(x-4\right)}\right)dx$
$t^4-2t^2y+y^2$
$\frac{246x^3+191x^2}{4x+1}$
$\left(8-7x\right)\left(8+7x\right)$
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