calculate the inverse hyperbolic cotangent of given angle

Parameters

actanh angle :integer :floating :complex :rational :quantity

Returns

Examples

copy
print actanh 0                  ; nan
print actanh 1                  ; inf
print actanh 10.0               ; 0.1003353477310756

copy
actanh to :complex @[pi 1]
; => 0.2946214403408572-0.09996750087543603i

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