$100a^4-8a^2b^2+16b^4$
$4x-6-x$
$f^2-16f+15$
$\lim_{x\to0}\left(x\sin\left(6x\right)\right)$
$16x+36$
$5\sqrt{13x}-9\sqrt{13x}$
$x^{-5}\cdot x^1$
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