$\int_0^4\left(\frac{1}{x^2-x+6}\right)dx$
$\int x\left(-\frac{x+6}{x^7}e^{-x}\right)dx$
$x^2+x^2-5+2y$
$2x-4\le4x+2$
$x\left(2-x\right)^2$
$5x^2+20x+3$
$\lim_{y\to-1}\left(y^3\:-\:2y^2\:+\:3y\:-\:4\right)$
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