$2\sin\left(5x\right)\cos\left(5x\right)$
$2a^{\frac{1}{3}}\left(ab^{\frac{1}{2}}\right)^{\frac{2}{3}}$
$z^2-18z=-41$
$\frac{1-n^7}{1+n}$
$9\sqrt{x^{12}}$
$3.5m^3n^2-9.5m^3n^2$
$15\:x\:\frac{1}{7}$
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