$\frac{x^4}{25}-\frac{2}{5x^2y^2}+y^4$
$2m+1n$
$y=\left(x^2+5x\right)^2$
$\lim_{x\to0}\left(\frac{1-x+lnx}{1+cos\left(9\pi x\right)}\right)$
$100a^2\:-\:20ab\:+\:b^2$
$100x^2-40x$
$n^2+5n+4$
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