$\int\frac{2x^3+3x}{x^4+3x^2}\:dx$
$3a+2b^2-5a+2b^2-8a$
$a^2-6ab+9b^2$
$\lim_{x\to\infty}\left(\frac{2x+1}{2x-1}\right)^{x+2}$
$5x+3x-7+9$
$\left(a^3+b^6\right)\left(a^6-a^3b^6+b^{12}\right)$
$5x^4-3x^4+\frac{2}{3}x^4$
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