$\left(x^{2}+1\right)^{2}$
$\frac{9-36a^{10}}{3+6a^5}$
$\frac{21x^{5}-4x^{4}-23x^{3}+37x^{2}-46x+15}{3x^{2}+2x-5}$
$\frac{n^3}{3n+7n^3}$
$\left(\frac{3}{2}xy\right)\left(\frac{9}{5}xy-\frac{1}{7}\right)$
$\frac{1}{1-\cos\left(x\right)}-\frac{1}{1+cos\left(x\right)}=2csc^2x$
$\left(11x-9\right)\left(11x+9\right)$
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