$\int\frac{x}{\sqrt{r^2-x^2}}dx$
$a+2a+9$
$\left(\frac{19^2-13^2-21.16^2}{-2\cdot13\cdot21.16}\right)$
$\lim_{x\to\infty}ln\left(1+\frac{1}{10x}\right)^x$
$\lim_{x\to\infty}\left(\frac{7x^3}{e^{7x}}\right)$
$5-x\le-4+2x$
$\left(-27d^2\right)^3$
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