$sen\left(180-a\right)=-sen\left(a\right)$
$\int\frac{x^2}{x^4+x^2}dx$
$-\frac{160}{+40}$
$15\left(-3\right)$
$2b\:+\:3b\:-\:6\:=\:-21$
$\frac{dy}{dx}=\frac{2}{3x}$
$17y^2+-30y^2$
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