$-2\left(2x-1\right)+1=-4x-3\left(x+3\right)$
$\int8\cos\left(5x\right)^6dx$
$\lim_{x\to0\:}\frac{x^{2\:}-2x+2}{4x-2}$
$3a^3-5ab^2-6a^2b^2\:entre\:-2a$
$\lim_{x\to\infty}\left(x+1\right)\left(\frac{-1}{\sqrt{2}}\right)^{\left(x+2\right)}$
$\left(k+8\right)\left(k-11\right)$
$\:-\left(-18\right)-\left(-12\right)$
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