$\frac{d}{dx}\left(ln\left(x+\sqrt{x^2+k}\right)\right)$
$\frac{x^3+5x+2}{x+2}$
$\lim_{x\to0}\left(\:\tan\left(3x\right)\right)$
$3\sqrt{2}cos\left(x\right)+3=6$
$\int\:\frac{x+2}{\sqrt{4-x^2}}dx$
$3y+25=-17$
$\int\frac{1}{\left(81+x\right)\sqrt{x}}\:dx$
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