$75m^6n^2-147$
$x\le6-x$
$\left(\frac{x}{a}+\frac{1}{x}\right)$
$\left(7c\right)^{-1}$
$\frac{\frac{1}{\sin\left(x\right)}\cos^2\left(x\right)}{\tan^2\left(x\right)}$
$\frac{x^4+x^2+2}{x-2}$
$\left(9a-6b\right)^2$
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