$9x^2y^2\:-\:12axy\:+4a^2$
$\left(-3x^3+y\right)\left(-5+x^2\right)$
$yx+y.\frac{dy}{dx}=0$
$\lim_{x\to\infty}\left(\frac{x^2}{cos^2\left(n-1\right)-\left(n+1\right)^2}\right)$
$100+6,6$
$\frac{-3x^2+27}{-x+5}$
$\frac{4\left(h^{4}\right)^{4}}{12h}$
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