$\int\frac{x^5+x^4-x^3+3x+4}{x^4+4}dx$
$3x^2+21x-90$
$\left(2xg+z\right)^2$
$z^2-20z$
$-3y^2+2x+2+3x$
$-2r-5=6-r-2r$
$\frac{d}{dx}\cot\left(sen3x\right)$
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