$\lim_{x\to3}\left(\frac{x-4}{x-3}\right)$
$\left(\frac{1}{2}x^2-4\right)^2$
$3^3\:x\:3^3$
$45.87\cdot3.5$
$cot\left(x\right)-csc^2\left(x\right)cot\left(x\right)$
$\int \frac { 1 } { x ( x + 1 ) } d x$
$e^x\cdot dx+\left(1+e^x\right)\tan\left(y\right)\cdot dy=0$
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