$-21+-1+0$
$\int\left(\frac{1-x^2}{sqrt\left(1+x^2\right)}\right)dx$
$\left(a^2+4\right)\left(a^2\right)$
$\left(m-7\right)^2-\left(m+7\right)^2$
$\int\frac{4t\:+6}{2t+1}\:\:\:dx$
$x+12<26$
$\frac{d}{dx}\sqrt[2]{\frac{1}{xy}+x^y}$
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