$\lim_{x\to0}\left(\frac{-9x}{x+\left(\sqrt{\left(x^2\right)+9x}\right)}\right)$
$x+\frac{1}{3x-1}$
$9\tan^2\left(x\right)+16$
$tanx\:+sec\:x\:-1$
$\frac{d}{da}\left(lg\:e^{ax}\right)$
$16-3\cdot\left|5+\left(-2\right)\cdot\left(-4\right)-21\right|$
$\int\frac{3x^2}{\:3+x^2}dx$
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