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![\dfrac{d\left (x^{1/5}+y^{1/5}\right)}{dx}=\dfrac{d}{dx}(4)\\ \\ \\
\dfrac{d(x^{1/5})}{dx}+\dfrac{d(y^{1/5})}{dx}=0\\ \\ \\
\dfrac{1}{5}x^{\frac{1}{5}-1}+\dfrac{1}{5}y^{\frac{1}{5}-1}\cdot\dfrac{dy}{dx}=0\\ \\ \\
\dfrac{1}{5}x^{-4/5}+\dfrac{1}{5}y^{-4/5}\cdot\dfrac{dy}{dx}=0\\ \\ \\
\dfrac{1}{5}y^{-4/5}\cdot\dfrac{dy}{dx}=-\dfrac{1}{5}x^{-4/5}\\ \\ \\
\dfrac{dy}{dx}=-\dfrac{x^{-4/5}}{y^{-4/5}}\\ \\ \\
\dfrac{dy}{dx}=-\dfrac{y^{4/5}}{x^{4/5}} \dfrac{d\left (x^{1/5}+y^{1/5}\right)}{dx}=\dfrac{d}{dx}(4)\\ \\ \\
\dfrac{d(x^{1/5})}{dx}+\dfrac{d(y^{1/5})}{dx}=0\\ \\ \\
\dfrac{1}{5}x^{\frac{1}{5}-1}+\dfrac{1}{5}y^{\frac{1}{5}-1}\cdot\dfrac{dy}{dx}=0\\ \\ \\
\dfrac{1}{5}x^{-4/5}+\dfrac{1}{5}y^{-4/5}\cdot\dfrac{dy}{dx}=0\\ \\ \\
\dfrac{1}{5}y^{-4/5}\cdot\dfrac{dy}{dx}=-\dfrac{1}{5}x^{-4/5}\\ \\ \\
\dfrac{dy}{dx}=-\dfrac{x^{-4/5}}{y^{-4/5}}\\ \\ \\
\dfrac{dy}{dx}=-\dfrac{y^{4/5}}{x^{4/5}}](https://tex.z-dn.net/?f=%5Cdfrac%7Bd%5Cleft+%28x%5E%7B1%2F5%7D%2By%5E%7B1%2F5%7D%5Cright%29%7D%7Bdx%7D%3D%5Cdfrac%7Bd%7D%7Bdx%7D%284%29%5C%5C+%5C%5C+%5C%5C%0A%5Cdfrac%7Bd%28x%5E%7B1%2F5%7D%29%7D%7Bdx%7D%2B%5Cdfrac%7Bd%28y%5E%7B1%2F5%7D%29%7D%7Bdx%7D%3D0%5C%5C+%5C%5C+%5C%5C%0A%5Cdfrac%7B1%7D%7B5%7Dx%5E%7B%5Cfrac%7B1%7D%7B5%7D-1%7D%2B%5Cdfrac%7B1%7D%7B5%7Dy%5E%7B%5Cfrac%7B1%7D%7B5%7D-1%7D%5Ccdot%5Cdfrac%7Bdy%7D%7Bdx%7D%3D0%5C%5C+%5C%5C+%5C%5C%0A%5Cdfrac%7B1%7D%7B5%7Dx%5E%7B-4%2F5%7D%2B%5Cdfrac%7B1%7D%7B5%7Dy%5E%7B-4%2F5%7D%5Ccdot%5Cdfrac%7Bdy%7D%7Bdx%7D%3D0%5C%5C+%5C%5C+%5C%5C%0A%5Cdfrac%7B1%7D%7B5%7Dy%5E%7B-4%2F5%7D%5Ccdot%5Cdfrac%7Bdy%7D%7Bdx%7D%3D-%5Cdfrac%7B1%7D%7B5%7Dx%5E%7B-4%2F5%7D%5C%5C+%5C%5C+%5C%5C%0A%5Cdfrac%7Bdy%7D%7Bdx%7D%3D-%5Cdfrac%7Bx%5E%7B-4%2F5%7D%7D%7By%5E%7B-4%2F5%7D%7D%5C%5C+%5C%5C+%5C%5C%0A%5Cdfrac%7Bdy%7D%7Bdx%7D%3D-%5Cdfrac%7By%5E%7B4%2F5%7D%7D%7Bx%5E%7B4%2F5%7D%7D)
![\boxed{\dfrac{dy}{dx}=-\left( \dfrac{y}{x}\right)^{4/5}} \boxed{\dfrac{dy}{dx}=-\left( \dfrac{y}{x}\right)^{4/5}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Cdfrac%7Bdy%7D%7Bdx%7D%3D-%5Cleft%28+%5Cdfrac%7By%7D%7Bx%7D%5Cright%29%5E%7B4%2F5%7D%7D)
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