Solution 12150: Multiplication of Complex Numbers in Polar Form on the TI-89 Family, TI-92 Family and Voyage™ 200 Graphing Calculators.
How do I multiply complex numbers in polar form on the TI-89 family, TI-92 family, and Voyage 200 graphing calculators?
The following example demonstrates how to multiply two complex numbers in polar form.
Multiply (45Ð30) by (45Ð-30).
1) Press [(]  .
2) Press [2nd] [Ð].
3) Press   [)] [x] [(]  .
4) Press [2nd] [Ð].
5) Press [(-)]   [)].
6) Press [ENTER].
For additional instructions and examples on performing these types of calculations, refer to the online guidebook for your calculator model.