$\frac{54x^4}{3x^2}$
$n^{-1}\left(\frac{1-x}{1+x}\right)$
$\left(5+10a\right)$
$\int9\:\ln\left(z\right)dz$
$-1\cdot9\cdot7$
$\cot\left(x-y\right)=\frac{1}{\tan\left(x-y\right)}$
$4x-2y^2=0$
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