This function calculates the hyperbolic secant of specified complex number.
IMSECH(complex_num)
The complex_num argument is a complex number to return the hyperbolic secant for.
An error is returned if the complex_num argument is not in the form "x+yi" or "x+yj".
Accepts numeric and string data. Returns string data.
IMSECH("3+6i") gives the result 0.09544
IMSECH("7+2i") gives the result -0.00075