$12x^2+5x-2=0$
$\lim_{x\to\infty}\left(\frac{1+3^x}{1-3^x}\right)$
$\frac{10x^2\:-20}{4x^2-10x}$
$\int\frac{3x^2+2}{x^2\left(x+2\right)}dx$
$\int\left(5a^2x^2\right)dx$
$\int\frac{x^3+x^2+x+2}{x^4+3x^2+3}dx$
$\int\frac{\left(x^4\right)}{\left(x^2+4\right)^{0.5}}dx$
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