TANH Function
The TANH function returns the hyperbolic tangent of the argument, where the argument is an angle expressed in radians.
TANH Function
The following example returns the hyperbolic tangent
of the values in the degrees column of the anglestbl table.
The expression passed to the TANH function converts the degrees to
radians.
SELECT TANH(degrees*180/3.1416) FROM anglestbl;