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A function that can be used in Formulas.
arccosh (x)
x.
arccosh (x) = ln (x + √(x2−1)) |
assert arccosh (1.0) = 0
assert arccosh (0.9) = undefined
assert arccosh (0.0) = undefined
assert arccosh (-10.0) = undefined
assert arccosh (undefined) = undefined
© Paul Boersma 2023