$\int\left(\frac{x^3}{a^2x^2+b^2}\right)dx$
$\frac{1-m^4}{1+m^2}$
$\frac{-7x^3+x^5+35x}{-1+x^2}$
$5x\:+11y\:-9\:-20x\:+1\:-y$
$\lim_{x\to0}\left(\frac{e^x-e^{\tan\left(x\right)}}{\tan\left(x\right)}\right)$
$-12.3-\:5,7$
$5^{12}x\:5^8$
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