$9x^{2+48xy+64y^2}$
$8r+12p-7-3p$
$\frac{15x^2+x^2-2}{3x^2-1}$
$s^2+6s+13$
$\frac{2x^2-2x-4}{x^2+4x+3}$
$71+2+\left(-1\right)+4$
$\lim_{x\to\infty}\left(\frac{3x+1}{3x-5}\right)^{2x}$
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