$\lim_{x\to0}\frac{\left(x+n\right)^3-x^3}{n}$
$\frac{dy}{y}=1$
$3x\left(x^{2}+6\right)$
$\left(-4-8\right)+\left(-9+21\right)-\left(7-5\right)$
$\left(-2\right)^{6}$
$\left\{cot^2x,csc^2x\right\}$
$\frac{\left(2x^4-x^3+6x^2-10x+13\right)}{x-1}$
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