$y''+4y'+5y=0$
$\lim_{x\to\infty}\left(1-\frac{2}{x}\right)^{4x}$
$\left(-15\right)\left(-18\right)$
$1000x^4-1296y^4$
$5^2-7\cdot5+10$
$6m^3n^4\left(-12m^2n^2+4mn^2\right)$
$y^2\:+\:11y\:-\:6y\:+\:y^2$
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