$y\left(1-x\right)dx+x^2\left(1+y\right)dy=0$
$\left(9x^3y^2-3z^4\right)^2$
$x-5<x-2$
$sin^2x=2\left(cosx-1\right)$
$\sqrt{sec^2a\:+\:cosec^2a}=\:tan\:a\:+\:cot\:a$
$x^2-16x+63$
$\lim_{x\to\infty}\left(\frac{\left(3x+2\right)}{3x+4}\right)^{4x+2}$
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