For a TI-86
Converting rectangular to polar
Press "2ND" and then "MORE" for the MODE screen
Highlight PolarC and press "ENTER"
Quit that screen.
Now ready to go.
A example of converting 5+j6
Enter "(5,6)" in the calculator and press "ENTER"
Should get (7.81024967591*angle*50.1944289077)
Converting polar to rectangular
Press "2ND" and then "MORE" for the MODE screen
Highlight RectC and press "ENTER"
Quit that screen.
Now ready to go.
A example of converting 5*angle*35
Enter "(5*angle*35)
Should get (4.09576022145,2.86788218176)
Note
*angle* is the symbol when you press "2ND" then ","
Note 2
To round the an decimal places press "2ND" then "MORE" for the MODE screen and on the line that says float, choose a number on that line for the number of decimal places you would like to have.
More can be found at
http://docs.google.com/gview?a=v&q=cache:nAC57BtC6IIJ:myweb.wit.edu/khabaria/ELEC195_files/ti86cplx.pdf+ti-86+convert+to+polar&hl=en&gl=us
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