Sech-func
The sech(x) function returns hyperbolic secant of x. An absolute value larger than about 710 is computationally out of bounds and returns missing value.
double sech(double x)
x
Returns hyperbolic secant of x.
aa = sech(10); aa = ; //should return 9.0799859337817E-5
Sinh, Cosh, Tanh, Coth, Csch