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Solve: $ (e^x+e^{-x} )\large\frac{dy}{dx}$$=1- \large\frac{(e^x+e^{-x})^2}{(e^x-e^{-x})}$$y$

$(a)\;y.(e^x-e^{-x})=e^x+e^{-x}+c \\ (b)\;y.(e^x-e^{-x})=\log (e^x+e^{-x})+c \\ (c)\;y.(e^x-e^{-x})=\log (e^x-e^{-x})+c\\ (d)\;y=\log (e^x+e^{-x})+c $

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