$\int e^{6x-7}dx$
$\frac{dy}{dx}-y\tan\left(x\right)=2\sin\left(x\right)$
$\lim_{x\to2}\left(\frac{x^2-9x+14}{x^2-49}\right)$
$h^2-\frac{3}{4}h+\frac{9}{36}$
$90+60+45$
$\left(xy-20\right)^2$
$\frac{x^4+x^3-1}{x^3-2x^2}$
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