$\int\frac{x^3-3x^2+x-1}{x-2}dx$
$\frac { x ^ { 9 } } { x ^ { 4 } }$
$\lim_{x\to\infty}\left(\frac{3x^3-11}{24x-9}\right)$
$sen\theta\:\:sec\theta\:\:cot\theta\:-\:cos^2\theta\:$
$\int\frac{x^2+4}{x^2-4x+4}\:dx$
$\lim_{x\to-3}\left(x^2-3x+9\right)$
$\left(1+y^2\right)\left(1-y^2\right)$
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