$81y^2+14xy+y^2$
$\frac{dy}{dx}=x^3\cos\left(y\right)$
$5\cdot x=80$
$\frac{dy}{dx}=\frac{1-x^2+y^2-x^2y^2}{x^2}$
$\int\left(3e^{3x}\:+\:2e^{2x}\right)^2\:dx$
$\left(\frac{5}{7}p\:-\frac{1}{7}q\right)^2$
$\frac{144m^4-4m^5n^6}{2mn^3+12m^2}$
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