$\frac{x^2-3x+3}{x+1}$
$27.98+673.11$
$\lim\:_{x\to\:+\infty\:\:}\left(\frac{2x+a}{2x+b}\right)^2$
$( a + 2 ) ^ { 2 }$
$\left(4\sqrt{x}+9\sqrt{y}\right)^2$
$\int3x^3\:e^{2x}\:dx$
$1\:-\:-6$
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