$\left(3x^2+9xy+27y^2\right)$
$\left(a-11b\right)\left(a-12b\right)$
$a^2-ab+b^2+a^2-5b^2$
$\left(4+t^2\right)\frac{dy}{dt}+2ty=4t$
$36+2$
$\sin^2\left(a\right)-5\sin\left(a\right)+2$
$\lim_{x\to\infty}\left(\frac{15x^2}{e^{4x}}\right)$
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