$\frac{3}{x+1}+\frac{3}{x-1}$
$\frac{27m^3-1}{3m-1}$
$\left(z^{\frac{1}{2}}+w^{\frac{1}{2}}\right)\left(z^{\frac{1}{2}}-w^{\frac{1}{2}}\right)$
$\lim_{x\to\infty}\left(\frac{x^2+3x}{x^2-2}\right)^x$
$\frac{1-2\cos\left(a\right)^2}{\cos\left(a\right)\sin\left(a\right)}$
$\sqrt{\frac{27x^3}{16}}$
$\int x\left(7-x^2\right)^{15}dx$
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