$-4c-9+6+8c$
$\int sen\left(3x\right)cos\left(2x\right)dx$
$\frac{13m^3+15m+6m^4-6}{2-m+2m^2}$
$\frac{5x-6}{x^2-x-6}-\frac{3}{x+3}$
$4m^2-81$
$\left(a+x^2\right)-2\left(a+x\right)\left(x+y\right)+\left(x+y\right)$
$\int2x\:e^{-x^2}dx$
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