$\left(-4x^2+-3y^2\right)^2$
$x^2-6x+9\ge0$
$\left(9x^3+4y^b\right)\left(9x^3-4yb\right)$
$8n+3\left(-n-3\right)$
$49x^4-14x^2y+y^2$
$3x^2-36x+60$
$\lim_{x\to+00}\:\frac{\left(\sqrt{x+a}-\sqrt{a}\right)}{x}$
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