$\lim_{x\to4<x}\left(\frac{\left|x-4\right|}{x-4}\right)$
$-a^2bc+c^4-6a^2bc^3+5c^4-6c^4$
$\frac{\sqrt{x+25}-5}{5}$
$\left(5a^3-7a\right)$
$\frac{4x^3-2x^2+5x+3}{x^2-2}$
$\sqrt{x}^5\:.\:\sqrt{x}^2$
$\int\frac{1}{\left(t^2+1\right)^{\frac{3}{4}}}dt$
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