$\int e^{-2t}cos\left(-3t\right)dt$
$4x^2+48x+144$
$6-3h^2+6h^2+2$
$\frac{60+x^2}{x-1}$
$6b^2-3xb^2$
$\lim_{x\to\infty}\:\frac{0^n-1}{0^n+1}$
$\left(2a+3\right)\left(2a+1\right)$
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