$\:\int_{1.5}^{2.5}\:2sen\left(\pi x\right)dx$
$4\left(b+4\right)$
$\left(9ab+4cd\right)^2$
$1+\frac{1}{\cos^2}$
$42a^2-49a$
$5x^2-18x+9$
$\frac{x-2}{x^2-4x}$
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