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This function calculates the secant of the specified complex number.
IMSEC(complex_num)
The complex_num argument is a complex number to return the 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.
IMSEC("11-2i")
gives the result 0.00126
IMSEC("3-6i")
gives the result -0.00490