simplify cosh(arcsinh(x))

Let's reduce: cosh(arcsinh(x))
For real t, the hyperbolic cosine being strictly positive, cosh(arcsinh(t)) = 1 + t2
ⅰ cosh(arcsinh(x)) = 1 + x2
1 + x2
▶Simplified form:   x2 + 1

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