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For x at least 1, arcosh x can be written as which logarithm?
Aln(x + √(x² + 1))
Bln(x - √(x² - 1))
Cln(x + √(1 - x²))
Dln(x + √(x² - 1))
Answer & Solution
Correct answer: D. ln(x + √(x² - 1))
Solving y = cosh u with u >= 0 gives u = ln(y + √(y² - 1)), defined for y >= 1.
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