$\lim_{x\to0}\left(\frac{\sqrt{x-a}-\sqrt{a}}{x}\right)$
$\frac{d}{dx}\:\left(x+1\right)\left(x-10\right)$
$\frac{dy}{dt}=\frac{\left(4t+ty^2\right)}{\left(9+t^2\right)}$
$\frac{50x}{x}$
$\log12+2\log\left(x\right)$
$\int\frac{3}{2x^2-3x}dx$
$4x^2-8x+15\:$
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