$12^2-4\left(2\right)\left(8\right)$
$\frac{x^{12}-y^{15}}{x^4+y^5}$
$\left(6x\:-\:6x\right)+\left(8x\:-9x\right)$
$\int\left(\frac{9}{\left(3+x^2\right)^2}\right)dx$
$\lim_{x\to0}\left(\sqrt{25-x^2}-5\right)$
$z^2-12z+20$
$\int2xsin\left(5x^2+7\right)dx$
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