find constant term in [2x-1/x]^10
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![(2x - \frac{1}{x} ) {}^{10} (2x - \frac{1}{x} ) {}^{10}](https://tex.z-dn.net/?f=%282x+-++%5Cfrac%7B1%7D%7Bx%7D+%29+%7B%7D%5E%7B10%7D+)
![= ( \frac{2x {}^{2} - 1}{x} ) {}^{10} = ( \frac{2x {}^{2} - 1}{x} ) {}^{10}](https://tex.z-dn.net/?f=+%3D+%28+%5Cfrac%7B2x+%7B%7D%5E%7B2%7D++-+1%7D%7Bx%7D+%29++%7B%7D%5E%7B10%7D+)
![= \frac{(2x {}^{2} - 1) {}^{10} }{x {}^{10} } = \frac{(2x {}^{2} - 1) {}^{10} }{x {}^{10} }](https://tex.z-dn.net/?f=+%3D+%5Cfrac%7B%282x+%7B%7D%5E%7B2%7D++-+1%29+%7B%7D%5E%7B10%7D+%7D%7Bx+%7B%7D%5E%7B10%7D+%7D+)
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