$\int_0^1\frac{1+x}{\sqrt{4-x^2}}dx$
$\frac{2x^3-5x^2+x-2}{x-1}$
$\left(\frac{1}{3}xy+2\right)^3$
$n+2=-13$
$3k<27$
$\frac{sec\:\left(x\right)}{1-sin\left(x\right)}=\frac{1+sin\left(x\right)}{cos^3\left(x\right)}$
$2x\ge-100$
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