$3x^2+7x+5\left(x+3\right)+x^2$
$\left(a^2b+b\right)^2-\left(a^2b-3\right)^2$
$\frac{243x^5+32}{3x+8}$
$y=\left(4-2x\right)^3-\frac{1}{5x^2}$
$\frac{-1}{1+\left(x^2+1\right)^2}$
$225p^{4}-49a^{4}y^{6}z^{4}$
$\lim_{x\to2}\:\frac{x^n-2^n}{x-2}$
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