$\int\left(\frac{x+1}{x^2+2x-2}\right)dx$
$2+0-7+8-10-15+14-20+15$
$\left(6x+7\right)\left(2+x\right)$
$x+x+4x$
$\lim_{x\to2}\left(\frac{sen2x}{sen3x}\right)^{sen\left(2x+\frac{\pi}{2}\right)}$
$x^4+4x^3-x^2-20x-20$
$\left(4\left(4\right)^{\frac{n}{2}}\right)$
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