$1+x=-4$
$\lim_{x\to\infty}\left(\frac{-x}{xe^{-x}}\right)$
$y'=\:2x^2+\:3x^2y+\:6xy+\:4x+\:3y+\:2$
$t\left(t+8\right)$
$\left(3x^2-4y^2\right)^2$
$\lim_{x\to\pi}\left(\frac{1-\cos\left(x\right)}{\sin\left(x\right)}\right)$
$x+5<0$
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