The Product and Quotient of Complex Numbers in Trigonometric Form

This video explains how to find the product and quotient of complex number is trigonometric form.
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[bullcleo1]

If you must have a positive angle, you can use a coterminal angle. Any coterminal angle would have the same trig function values. Coterminal angles have the same terminal side in std position. You can add or subtract 360 degrees or 2pi to find a coterminal angle. For example if you have -30 degrees, -30 + 360 = 330, so 330 degrees is coterminal to -30 degrees and will have the same reference angle and trig function values.

[asmcriminaL]

okay never mind, i missed the formulas the first time. It's a good video.

[asmcriminaL]

You're going to fast, it would be nice if there was a simple examples at first. You just threw a big equations at us. Without really working up to it.

[sifrael]

I definitely agree with "igorflato". He is the most talented teacher on the Web.

[Luke DeRosa]

woah man, fantastic job you helped a lot

[igorflato]

Very good lessons !!! This professor has a Talent to teach and explain....

[KrhystalZz]

Sometimes when finding the angle from the complex form I get a negatice angle, I had to find a positive number. Teacher said something about finding a angle which would relate to the negative angle I got, and find the quadrant in which the complex number would be in and find it there. However, it doesn't always work and I don't know if she is wrong or should I just find its positive corresponding angle diregarding the quadrant?