$m^2+2mn+n\:^2-1$
$\sen\alpha\left(1-\cos\alpha\right)\left(1+\sec\alpha\right)=\sen\alpha\cdot\cos$
$\left(2x-3\right)\left(x-2\right)+x\left(x+3\right)$
$-3x^6\cdot5x^3+20x^9$
$s^2+9s+4$
$10b+30ab^2$
$\left(12a-4b\right)^2$
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