$\left(2m-9n\right)^2$
$128+453$
$\int\left(\sqrt{4x^2-1}\right)dx$
$\int\sqrt{2+\sqrt{1+\sqrt{x}}}dx$
$\int\frac{1}{1+e^{-5x}}dx$
$a^2-10ax+25x^2-9$
$4\cdot x-4\cdot y-7\cdot x+6\cdot y$
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