$\frac{\left(x^5+x-1\right)}{2x^4+6x^2+4}$
$\frac{25xyz}{40yz}$
$\sqrt{x^2+4x}-x+2$
$\int\left(\frac{x}{1-x+x^2}\right)dx$
$\lim_{x\to\infty}\left(e^x\left(\arctan x-\frac{\pi}{2}\right)\right)$
$4x^2-6=30$
$\left(5a+3a\right)^2\left(3a^2-5a\right)$
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