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Description: Returns the inverse hyperbolic cosine of a number. The inverse hyperbolic cosine is the value whose hyperbolic cosine is Number, so ACOSH(COSH(Number)) equals Number.
Syntax: ACOSH(Number)
Number is any real number equal to or greater than 1.
Example:
ACOSH(1) = 0 [the inverse hyperbolic cosine of 1]
ACOSH(10) = 2.993223 [the inverse hyperbolic cosine of 10]
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