$4\cdot r+5\le9$
$\lim_{x\to0}\left(\:\frac{2x}{1+\:e^x}\right)$
$\lim_{x\to\infty}\left(1+\frac{3}{x}\right)$
$\frac{d^3}{dx^3}\left(x^{-6}+x^6\right)$
$\left(x+y+1\right)^3$
$3w^2-5w+3$
$2x^2+5x+3=0$
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