$-x^2\:y+x^2\:y$
$\int\frac{x^3+4}{\left(x+6\right)\left(x+5\right)}dx$
$\frac{\cot^2x}{\csc x-1}-1=\csc x$
$\frac{x^{2}-3x+4}{2x^{2}-x-1}$
$\int\frac{\left(x+1\right)^2}{x^3+x}dx$
$\frac{-6x^2y^5z^2}{3x^{-6}y^5z^6}$
$3x\:-\:y\:+\:4\:+\:2y\:-\:9\:$
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