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e^x +e^(-x) =3
e^x -3+e^(-x) =0
[e^(x/2)]^2 -3+[e^(-x/2)]^2 =0
e^(x/2) = [(3+√5)/2] e^(-x/2) or e^(x/2) = [(3-√5)/2] e^(-x/2)
e^x = [(3+√5)/2] or [(3-√5)/2]
x=ln[(3+√5)/2] or ln[(3-√5)/2]
e^x -3+e^(-x) =0
[e^(x/2)]^2 -3+[e^(-x/2)]^2 =0
e^(x/2) = [(3+√5)/2] e^(-x/2) or e^(x/2) = [(3-√5)/2] e^(-x/2)
e^x = [(3+√5)/2] or [(3-√5)/2]
x=ln[(3+√5)/2] or ln[(3-√5)/2]
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