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I try to visualize complex polynoms http://weitz.de/fund/
and do the calculation by transfer of polynom variables to polar coordinates. I have 2 function to calculate the modulus preal(o, j ) and the angle pimag(o, j , t)
1. Bug
after definition of pimag(o, j , t) the argument list was changed to pimag( j, o , t)
- it cost some time to recognize that
2. Bug
if argument o is a complex number or variable (a_1...a_5) the functions preal/pimag fail in AlgebraView, but works in CAS
- see Points A, Z_3
in second App of
https://www.geogebra.org/m/xaekmgkn
Any idea?
The same problem 
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