$-18+1$
$\left(-15\right)\cdot\left(-9\right)$
$-19-10+8+12-15-20$
$\int_0^{\frac{\pi}{2}}\left(sin^{n-2}x\:cos^2x\right)dx$
$\lim_{x\to\infty}\left(\frac{ln\left(2\right)}{ln\left(x-1\right)+1}\right)$
$\int\frac{e^{2y}}{\sqrt[5]{1+e^y}}dy$
$\frac{x-x^2}{x-2-x^2}$
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