$4x^2-4xy^2+y^4$
$\left(8+\frac{4}{x}\right)^{\frac{1}{3}}$
$\frac{x^2}{x^2+1}=1$
$\lim_{x\to0}\left(\frac{1-cos\left(3x\right)}{sen\left(5x\right)}\right)$
$\int\left(t-csc\left(t\right)\right)dt$
$5-\left(-3+8\right)$
$\int_{\cdot\infty}^0\left(xe^x\right)dx$
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