$5^6+4$
$8\left(y-7\right)$
$\frac{\left(8x^3\:+\:4x^2\:-\:5x\:+\:6\right)}{\left(x^3-2x^2+1\right)}$
$e=\left(sen6^{\circ}-cos6^{\circ}\right)\left(sen3^{\circ}-cos3^{\circ}\right)+sen9^{\circ}$
$2x^2+7x-10x+5$
$\frac{4x^2-9y^2}{2x-3y}$
$5\left(92-978\right)$
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