$\lim_{x\to\frac{\pi}{2}}\left(\frac{\log\sin\left(x\right)}{\left(\pi-2x\right)^2}\right)$
$\:3y'+9y=\:0$
$4\left(n+1\right)-2$
$x-4x^2$
$9x^2+9x+36$
$\frac{3x-8}{\left(\left(3x-1\right)\left(x+2\right)\right)}$
$n^2-125^2$
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