Could someone explain to me how, (De Moivre's Theorem) r(cosx + isinx) is in polar form? This makes no sense to me. At all. I thought polar form was in the form (r, θ), where R is the radius from the origin of some point and theta is the angle from the positive x-axis. I keep seeing the above referred to as in "polar form", but it seems nothing but.

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but I agree with you that the name polar form is not really aplyable to this one

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