(eˣ - e⁻ˣ)/2 =0.5 hyperbolic functions

so that eˣ - e⁻ˣ =1

now solve eˣ - e⁻ˣ = 1

multiply with eˣ

make it into a quadratic in eˣ

solve using quadratic fomula to find the value of eˣ

take natural logarithm to find x

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