$\frac{8x^2+4x\:-7}{x^2}$
$\left(3xy-5a\right)x\left(3xy+2\right)$
$-5\left(-1+4\right)+10$
$12x^{12}-24x^9+12x^6$
$\frac{d}{dx}x^y=e^{x-y}$
$x^4\left(2x-1\right)$
$\int cs^2\left(\frac{x}{2}\right)dx$
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