$\left(\frac{4}{9}n^n+u^m\right)^2$
$3a^2-2+3a^2-2$
$csc^2\left(x\right)cos\left(2x\right)$
$\left(m-7\right)^2-\left(m+7\right)^2$
$dy+5y=\left(10\right)dx$
$\frac{2+x-2x^2}{x^4\left(x-1\right)}$
$a^4+a^3-9a^2-9a$
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