Areacosh/ln x + sqrt (x^2-1)/Aufgabe

Zeige, dass für ${}x\in \mathbb {R}$ , ${}x\geq 1$ , die Gleichheit

{}\,\operatorname {arcosh} \,x\,=\ln {\left(x+{\sqrt {x^{2}-1}}\right)}\,

gilt.

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