$\lim_{x\to1}\left(\frac{ln\:x}{20x-x^2-19}\right)$
$0.25x^2+2xy+4y^2$
$y^4+32y^2+256y=0$
$u\cdot u^2$
$\left(-\frac{3}{5}e^{\frac{1x}{3}}\right)\left(e^{-\frac{5x}{3}}\right)$
$m+4+3m-6-2m+mc-4mc$
$2\left(2\right)\left(-9\right)$
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