$dx=4\cos\left(\theta\:\right)d\theta$
$\lim_{x\to0}\left(\frac{13^x-1}{x}\right)$
$3r-\frac{3}{5}\:r$
$\left(16a^{-3}b^0c^{-2}\right)^0$
$\:\left(x\:+\:9\right)\left(x\:+\:4\right)$
$\left(3x^4+y^3\right)^3$
$\frac{\tan\left(x\right)+1}{\sin\left(x\right)\tan\left(x\right)+\cos\left(x\right)}$
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