$\left(2^2\right)^{-3}$
$2\left(x.cos\left(y\right)\right)\left(-x.\:sen\left(y\right)\right)-2\left(x.sen\left(y^2\right)\right)\left(2x.y.cos\left(y^2\right)\right)$
$x+x-2$
$\frac{1}{3}b^2-2b^2$
$\left(7-5\::\:5\:-\:7\right)$
$\int\frac{2x}{x^2+2x+2}dx$
$x^2+18x=63$
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