$-36\cdot5$
$\frac{8888888}{0}$
$x^2-\left(3x-1\right)^2$
$18y^2+12y+2$
$\int_{-1}^1\left(\frac{e^x}{1+e^x}\right)dx$
$\int x^2\sqrt{81+x^2}dx$
$x^2-14+144$
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