$9+\left(-2\right)\:+\:17\:+\:\left(-12\right)\:+\:3\:\left(-56\right)$
$32x^4-2x^2$
$\int\frac{1}{\sqrt{s-x^{2}}}dx$
$-\frac{7}{8}ab+ab$
$\:e\:=\:2\:sen\:30^{\circ}\:.\:cos\:30^{\circ}\:.\:ctg\:60^{\circ}$
$95\cdot75$
$\left(6y+40xy^2\right)$
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