$4x^2-49y^2$
$\frac{2}{x+3}-\frac{3}{x+2}$
$\frac{y}{e^{y^2}}y'\:=-\frac{1}{x^2}$
$\cot\left(x\right)=\frac{5}{6}$
$\left(5\right)\left(-6\right)\left(-10\right)$
$\left(30+12\right)\left(30^2-12^2\right)$
$\int\ln^2\cdot x^{20}dx$
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