$2\cos^22a-1$
$\sqrt[6]{y^3}$
$a^2-ab\:entre\:a$
$\left(k-h\right)^7$
$\left(5y+2xy\right)^2$
$\lim_{x\to5}\left(\frac{x^2+14x+45}{x^2-2x-35}\right)$
$\int_0^{\infty}\left(\frac{1}{1+x^2}-\frac{3}{3x+1}\right)dx$
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