$\frac{33}{x+5}=\frac{15}{11-x}$
$\frac{x}{\left(x^3+8\right)}$
$1-\left(\frac{1-sen^2\left(x\right)}{1+sen\left(x\right)}\right)=sen\left(x\right)$
$27a^3-64$
$\int\frac{x^3+3x^2-4}{2x}dx$
$\left\{5n-2m\right\}x\left\{5n+2m\right\}$
$-3xy^2+x^2y+\frac{2}{3}\:x^2y$
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