$\lim_{x\to5}\left(\frac{3x}{\left(x^2-x-20\right)\cos\left(x-6\right)}\right)$
$\int\frac{x}{\sqrt{4x^2+1}}dx$
$x+8=x-5$
$\:5x\:x\:2x$
$2x+20\le-30$
$\int\frac{1}{3x^3}dx$
$\int\frac{\log\:e}{x\sqrt{\log\:\left(10x^3\right)}}dx$
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