load(functs) gives access to the function gd(x), the gudermannian. It is constructed wrongly, it should be 2 * atan(%e^x) - %pi/2, not as given below in documentation which is also wrong.
Function: gd (x)
Returns the Gudermannian function 2 * atan(%e^x - %pi/2).
To use this function write first load(functs).
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