$\frac{3x^2+7x-1}{x+3}$
$\lim_{x\to0}\left(\frac{\pi\cos\left(\pi x\right)\sin\left(x\right)}{\cos\left(x\right)\sin\left(\pi x\right)}\right)$
$\left(3a^4\:-\:5b^2\right)^2$
$4^2-4+5$
$3\:csc\:2x=\frac{3\:csc\:x}{2\:cos\:x}$
$\sqrt{7}-\sqrt{7}$
$\int17\sec^4\theta\:\tan^2\theta\:d\theta\:$
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