Anyone know how to solve this with TI 84?
I have to solve 2e^(-90i) * 6e^(70i). the answer is 12e^(-20i), but my calculator (TI 84 plus silver) says 12e^(-65.9156i). not sure why...

Question

Anyone know how to solve this with TI 84?
I have to solve 2e^(-90i) * 6e^(70i). the answer is 12e^(-20i), but my calculator (TI 84 plus silver) says 12e^(-65.9156i). not sure why...

anonymous · Answer

you should sum 70i and -90i  then you get the answer..

anonymous · Answer

i is located at 2nd, $\cdot$

anonymous · Answer

and yeah, why would one want to do this with a calculator?

anonymous · Answer

I know how to input the problem, i'm just curious as to why I cannot get the correct form using a calculator.

anonymous · Answer

i tried with my ti83 ... it just doesnt seem to be well suited to this in any mode.

anonymous · Answer

is there anyway to convert theta into e^(xi) notation?

anonymous · Answer

prolly, but i havent played with those identities in soo long that the memory is a bit foggy

anonymous · Answer

@hazem-wardat

anonymous · Answer

7.59983044 - 9.28668818 i

anonymous · Answer

in polar, that is 12e^(-50.704565)

anonymous · Answer

12e^(-65.9156i)  =  -11.9799288 - 0.693761651 i

anonymous · Answer

I know how to get the answer, I just dont know how to get my calculator to show it.

anonymous · Answer

in polar (12 , -50.70456591