$\frac{-105x^3}{3x^4}$
$6x^2+13x-15=0$
$\left(2a^2-4b\right)^2$
$2x-18+-6x-2$
$\sqrt[1]{\left(81\right)}4$
$3\lim_{x\to45}\left(1-\tan\left(x\right)\right)$
$\left(mn-15\right)\left(mn+8\right)$
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