$\frac{\tan\left(x\right)\sin^2\left(x\right)}{1+\cos\left(x\right)}$
$\frac{120}{4}$
$\:\left(\frac{1}{2}+\:\sqrt{2}\right)^5$
$14x^4y-21x^3y$
$\lim_{x\to0}\left(\frac{1-\cos\left(6x\right)}{6x^2}\right)$
$\left[\left(2x\:+\:y\right)^2\:-\:\left(x\:-\:y\right)^2\right]$
$x^2+y^2-2xy=4$
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