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ACOSH

Description

Returns the inverse hyperbolic cosine of a number. The number must be greater than or equal to 1. The inverse hyperbolic cosine is a value whose hyperbolic cosine is a number, so ACOSH(COSH(number)) equals the number.

Examples

ACOSH(0.5) = NAN

ACOSH(2) = 1.3169578969248

ACOSH(NAN) = NAN

ACOSH(INF) = INF

ACOSH(-INF) = NAN

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