$\int\frac{x^2-4}{x^2-4x+4}dx$
$1-a^3$
$\int\left(3x^2-5x+\frac{7}{x}+2e^3\right)dx$
$x^4+3x^2+4\:$
$\int\frac{2x^2}{\left(x-3\right)^2}dx$
$\lim_{x\to2}\left(\frac{x^2-3x+8}{x-1}\right)$
$9x^2-81y^2$
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