$3m-6+m^2-5m+1$
$-3x^2-2x-5\:\:\:\:\:\:para\:x=2$
$-x<5$
$\frac{1}{\cos\left(a\right)\sin\left(a\right)}=\frac{2}{\sin\left(2a\right)}$
$9x^5-4x^4-3x^2\:entre\:2x-5$
$\left(-1\right)\cdot4\cdot\left(-2\right)\cdot5\cdot\left(-3\right)$
$\sqrt{\left(x+2\right)\left(x+8\right)+10+\left(x+5\right)^2}$
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