$4563-8765$
$ln\left(1-4\left(x^2\right)\right)$
$\left(20b-3\right)^2$
$\frac{f^2}{f^5}$
$81a^2-36ab+4b^2$
$9x^2-3x-5+5x-9$
$\frac{64}{4x^2}$
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