# [TI-M] math with polar and rectangular (imaginary) vectors

```Hi all,

I'm a newbie to the ti community though I've been using these
calculators  for years. I have a TI-92 and I'm running into trouble
using this calculator with my circuit analysis coursework. typically
we're presented with problems that involve polar and rectangular
coordinates which normally isn't such a big deal however in this case
the rectangular axis consist of real + imaginary, the calc doesn't like
this. I get domain errors for simply calculations like. (this is in
polar complex format)

(4/3) * -2i / (4/3) - 2i {product over the sum}

While in cylind vector format.

If I switch to rectangular vector format I get something that resembles

e^(-33.69*i) * 1.109

This corresponds in polar form of the correct answer as 1.109<-33.69

If i try a ->polar from this point I am also presented with a domain
error.

My question is, How can I work with vectors containing imaginary
numbers and convert
their result to polar form?

Another problem I'm having is the multiplication and division of polar
vectors. like

[10.<20]
-----------
[1.1<-33.7]

Gives me a "data type error" no mater what vector mode I'm in. I don't
understand.
the answer should be 9.39 < 53.7. If i do something like a matrix
divide i.e. "./" i get an answer that is completely wrong. Thanks in