$\frac{\sqrt{25x^2y^2}}{5}$
$\int_{-6}^6\left(\sqrt{36-x^2}\right)dx$
$-12abx+24aby$
$4x^2-9y^2=36$
$20n^2\:-\:7n\:-\:40$
$6\:-\:\left[4\:-\:\left(4\:-\:2\right)\right]\:-\:7\:-\:\left[4\:-\:\left(7\:-\:2\right)\:\right]\:$
$x^2+x+1<0$
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