$\left(3a+5\right)\left(-6a+9\right)$
$\lim_{x\to0}\left(\frac{\sin\left(2x\right)-3\cos\left(2x\right)}{1+x}\right)$
$x^2-24x-24$
$x^2+3x-10x$
$14m^{-4}n^0$
$\frac{1}{x^2}+4x+4$
$x^2\left(x^2-x-1\right)^2$
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