$b^2a-b^2a$
$9x^2-6x+2$
$\left(-x\right)\left(3x^4\right)$
$5x^2+12x+3=0$
$x^2-11x-60=0$
$\lim_{h\to0}\left(\frac{\left(x^2-3x+h\right)-\left(x^2-3x\right)}{h}\right)$
$\lim_{x\to0}\left(\frac{\cot\left(8x\right)\cdot8x-1}{8x^1}\right)$
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