$sen\theta\:=-0.45$
$2a-\left(2a-3b\right)+\left(4a-b\right)-5\left(-a+b\right)$
$12x-x^3$
$\frac{\left(3x-2\right)\left(3x+12\right)}{3}$
$-7589+918-345$
$2\left(a-c\right)+3$
$\int\frac{sin\left(x\right)}{x^2}dx$
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