Returns the inverse hyperbolic tangent of a number. Number must be between -1 and 1 (excluding -1 and 1). The inverse hyperbolic tangent is the value whose hyperbolic tangent is number; ATANH(TANH(number)) equals number.

Syntax

ATANH(number)

Number     is any real number between 1 and -1.

Examples

Formula

Description (Result)

=ATANH(0.76159416)

Inverse hyperbolic tangent of 0.76159416 (1, approximately)

=ATANH(-0.1)

Inverse hyperbolic tangent of -0.1 (-0.10034)

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