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[" 8.If "x^(y)=e^(x-y)," then show that ...

[" 8.If "x^(y)=e^(x-y)," then show that "(dy)/(dx)=(log x)/({log(xe)}^(2))],[" 9.Find "(dy)/(dx),(cos x)^(y)=(sin y)^(x)]

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