$\lim_{x\to2}\left(\frac{2-\sqrt{6x+16}}{4x^2-9^{2x+4}-7}\right)$
$\frac{x^2-6x}{x^2-2}=-x$
$\int\frac{\left(\log_{10}\left(x+4\right)\right)^3}{x+4}dx$
$4x^2+16x+21$
$\int3^{6x}\:dx$
$\left(x^2-x+y^3\right)^2$
$-5x+25x^2-20$
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