$0.3^{\infty}$
$cos4xsen2x+cos7x.senx+cos13xsen5x$
$\left(2x+1\right)^2-2\left(2x+1\right)+1$
$\int-7x^{-5}dx$
$\frac{2\pi}{3}+\pi$
$\int\left(\frac{1}{7x^2-8}\right)dx$
$2x^2+4x^2+4xy-4xy+4y^2+y^2$
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