lispdoc  results for atanh 
(atanh number)  Function: Return the hyperbolic arc tangent of NUMBER.

Mentioned in: CLtL2  12.1. Precision, Contagion, and Coercion CLtL2  12.5.2. Trigonometric and Related Functions CLtL2  12.5.3. Branch Cuts, Principal Values, and Boundary Conditions in the Complex Plane HyperSpec  Function SINH, COSH, TANH, ASINH, ACOSH, ATANH PCL  higher math  
(tanh number)  Function: Return the hyperbolic tangent of NUMBER.

Mentioned in: CLtL2  12.5.2. Trigonometric and Related Functions CLtL2  12.5.3. Branch Cuts, Principal Values, and Boundary Conditions in the Complex Plane HyperSpec  Function SINH, COSH, TANH, ASINH, ACOSH, ATANH PCL  higher math  
By Bill Moorier 