$y^4-8y^2$
$\frac{2x^2+11x+8}{x+4}$
$\lim_{x\to9}\left(\frac{12-\sqrt{x}}{\left(x-9\right)^4}\right)$
$\left(5+\sqrt{-9}\right)^3$
$4+\left(-2\right)^2$
$\int5ln\left(x^4\right)\cdot x^2$
$\int\left(\frac{e^{3x}-e^{4x}}{e^x}\right)dx$
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