$\int\cos\left(\frac{1}{4}x\right)dx$
$\lim_{x\to4}\left(\frac{\sqrt{5+x}-\sqrt{5}}{x-4}\right)$
$y'=\frac{y+1}{x-3}$
$\frac{7}{12}\:+\:\frac{1}{x}\:=\:-x$
$\left(x^2-1\right)^2<4x^2$
$resolver\:\frac{\sqrt[3]{3x^4}}{\sqrt[9]{273x^2}}$
$\left(7-z^2\right)\left(z^3-z+1\right)$
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