$\left(\frac{xyz}{x+y+z}\left(3x^2y^2z+1\right)\right)$
$\frac{d^3}{dx^3}\left(x\cdot\cos\left(x\right)\right)$
$\lim_{x\to0}\left(\frac{cotx}{e^x}\right)$
$9x^8-30x^4+25$
$x^2y'+xy=y$
$2x+11+6x$
$\lim\:_{x\to\:\:1}\left(\frac{\sqrt{x+8}+3}{x-1}\right)$
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