$\frac{14x^3}{21x^5}$
$9x\left(x+4\right)-3\left(x^2+4\right)$
$-atan\left(\frac{x}{x+2}\right)-atan\left(\frac{x}{x+4}\right)$
$\frac{m^3n^3-8y^{12}}{mn-2y^4}$
$\left(a-\frac{1}{\sqrt[2]{a}}\right)^n$
$\frac{x}{-11}=\:-3$
$y'=\frac{2x}{y^3}$
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