$5b+ba-9a-65b+ba-9a-6$
$100-\left(-90\right)$
$\frac{2\left(cosx\right)^2}{2cosx-senx}$
$\left(2xy^2\right)^4$
$\int_0^{\infty}\left(\frac{2\cdot x}{1+x^2}\right)dx$
$x^4+2x^3+x^2$
$-7-\left(-15\right)$
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