$\left(x^2+x+1\right)\left(x^2+x-2\right)$
$\left(a-12x^2a\right)^2$
$1x^2+16x+c$
$\frac{1-\:sen\:b}{cos\:b}=\frac{cos\:b}{1+\:sen\:b}$
$\left(5x^2y-7x^4y^6\right)^3$
$\frac{2x^2+4x+6}{\left(2x+3\right)\left(2x+2\right)}=\frac{17}{35}$
$\frac{4x+1}{3}\ge\frac{12x-3}{7}$
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