$5+9a-2a^2$
$\left(9x^3\right)\left(-10x^3\right)$
$-13+x=-19$
$\int2sen^2\left(7x\right)cos\left(7x\right)dx$
$\frac{\left(3x^3-6x^2-9x-18\right)}{\left(3x-1\right)}$
$\int2x\cdot tan^{-1}\left(5x\right)dx$
$1-2x^3+1x$
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