$-\left(-5\right)^2\:+\:-\left(-3\right)^2$
$81a^2b^4-100c^6$
$12x^2y^2-3xy^2+xy^2$
$\lim_{x\to\infty}\left(\frac{7x^2+5x+21}{8x^3+5x^2-9x}\right)$
$\left(7y-4f\right)\left(4f+7y\right)$
$\left(\frac{1}{5}k\right)^2$
$f\left(x\right)=2x+2x^5+\sqrt{4}$
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