Prove that (a) cosh 1 x = ln[x + (x 2 1)] (x 1) (b)

Question:

Prove that

(a) cosh–1x = ln[x + √(x2 – 1)] (x ≥ 1)

(b)

= + n(1+x) 1- tanh-x=;In| (x| < 1)

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