$\cos^2\left(a\right)\cdot\sec^2\left(a\right)=1$
$\left(x-y\right)\left(x^2+xy+y^2\right)$
$16+4-5+2-6$
$\frac{5x^2}{x^3-3x^2+3x-1}$
$5xw\:-\:10yw-\:25zw$
$\lim_{x\to0}\left(\sqrt{\frac{4-4\cos\:\left(x\right)}{x^3-x}}\right)$
$\frac{3\pi}{4}+2\pi$
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