\frac{1}{u} - 2u = \frac{e^{\frac{\pi}{2}}}{u} + \left( \frac{e^{\frac{\pi}{2}}}{u^2} \right)\frac{1}{u} - 2u = \frac{e^{\frac{\pi}{2}}}{u} + \left( \frac{e^{\frac{\pi}{2}}}{u^2} \right)

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