[(e^x+e^-x)^2 -(e^x-e^-x)^2]/(e^x+e^-x)^2 simplify and fin the inverse of the simplified equation
[(e^x+e^-x)^2 -(e^x-e^-x)^2]/(e^x+e^-x)^2 simplify and fin the inverse of the simplified equation
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