Returns the secant of a complex number.
Syntax
IMSEC( z )
where z is a complex number
Semantics
IMSEC( z ) is equivalent to IMDIV(1, IMCOS( z )).
To get better accuracy it is not implemented that way. With the notation IMSEC("a+bj")="c+dj" the used formulas are
real part
imaginary part