$\lim_{x\to0}\left(\frac{\left(x^4-1\right)}{x-1}\right)$
$72x^2-x-1$
$x^2-3x-2$
$sec\left(-x\right)-cos\left(-x\right)tan^2\left(-x\right)$
$y'=1-7x^2$
$\left(x+ab\right)^3$
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