$3x+6x\:+9$
$2xy+3y-4y+4$
$\lim_{x\to0}\left(\frac{x-\sin\left(x\right)}{\cos\left(x\right)+x^2+1}\right)$
$\left(5x\:-\:2y\right)\:\left(5x\:+\:2y\right)$
$\lim_{x\to0}\left(\pi cos\pi x\right)$
$30x^4+60x^3-60x^2$
$3x^{3\:}+9xy^2=5x^3$
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