Dean T.

asked • 04/29/18

Find the product

Find the product. Write the product in rectangular form, using exact values.

[4 cis 300°] [5 cis 120°]

1 Expert Answer


Kenneth S. answered • 04/29/18

4.8 (62)

I unveil the mysteries and secrets of trigonometry & you'll love it.

Dean T.

What did you do?


Kenneth S.

What did I do?  I did what DeMoivre's Theorem suggests:  For two complex numbers  r cis θ and s cis ω their product is
rs cis (θ+ω).  Then I removed one full rotation (360 degrees) from the angle sum.
I advise you to study the theorems carefully, with attention to worked examples in the textbook.


Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.


Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.