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atanh

(PHP 4 >= 4.1.0, PHP 5)

atanh -- Inverse hyperbolic tangent

Description

float atanh ( float arg )

Returns the inverse hyperbolic tangent of arg, i.e. the value whose hyperbolic tangent is arg.

Note: This function is not implemented on Windows platforms.

See also: atan(), asinh(), and acosh().

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