$6x^2-4x+6$
$\frac{dy}{dx}=\frac{1}{y.x^{2\:}}$
$\lim_{x\to-3}\left(\frac{\left(x^2+6x+9\right)}{-15-2x+x^2}\right)$
$\left(1.8\cdot9.87\right)-3.98$
$\frac{n^2}{9}+mn^2+9m^2$
$4x^3-8x^2-x+2\cdot x-1$
$x^2+3x+9-10x+13x$
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