$f^2+f+1$
$\lim_{x\to\infty}\left(\frac{4x^3-2x^2+6}{\pi x^3+4}\right)$
$2\cdot\left(x-1\right)\ge8$
$x^2+15x+15=2+x$
$\int dk$
$\int_0^2\left(\frac{1}{4x^2+9}\right)dx$
$\frac{1}{5}+\frac{3x}{2}\le\frac{2x}{3}$
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