$\frac{3^{13}}{3^{11}}$
$\lim_{x\to5}\left(\frac{x^3-4x-5x}{x^2+x-20}\right)$
$dy=\left(2xy+4x+2y+4\right)dx$
$\int cos\left(5x\right)\left(sen\left(5x\right)+4\right)dx$
$\frac{x^2-2}{x-1}$
$\int e^z\cos\left(z\right)dz$
$\int\left(\frac{x-2}{\sqrt{x}}\right)dx$
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