$tany\left(cosy-cscy\right)$
$k^2\:-\:5k\:+\:4$
$x+2\sqrt{3}<2\left(3x-4\right)$
$\lim_{x\to\pi}\frac{\sin\left(4x\right)}{\sin\left(3x\right)}$
$\frac{u^2}{25}-\frac{2}{5}\sqrt{5u}+5$
$\frac{d}{dx}\left(x^3\cos\left(x\right)-x\sec\left(x\right)\right)$
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