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