The principal argument of complex is a real value lying between -π (excluded) and +π (included) if the angle unit of the figure is the radian and between -180 (excluded) and 180 (included) if the angle unit of the figure is the degree.
The formula of a real calculus is not allowed to refer to a complex number. Thus if you want to use the principal argument of a complex number you have first to create a principal argument of complex.
You can then refer to this calculus (which is a real calculus) in another real calculus.
Here is an example :
A complex number named z has been created (not null) and you wish to create the image of a point through a rotation angle of which is the double of double of z principal argument.
You must use menu Calculus - New real calculus - Principal argument of complex.
A dialog box pops up.
Select complex z in the list.
In the field Name of the calculus, type a.
Press OK.
When you will create the 'image of a point point through a rotation you will enter 2*a in the field angle of rotation.
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