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# I have to rewrite the following to polar form: re^iθ (θ is in radian).

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I have to rewrite the following to polar form: re^iθ (θ is in radian).

• 2∠30°

I think that I have to use this: r*cos(θ) + i * sin(θ)

Jan 29, 2015

#4
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Thanks a lot!

You are a life saver

Jan 30, 2015

#1
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I think it is

$$\\2e^{i\pi/6}\\\\ =2(cos\frac{\pi}{6}+isin\frac{\pi}{6})\\\\ =2(\frac{\sqrt3}{2}+i*\frac{1}{2})\\\\ =\sqrt3+i$$

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You do not need this pic to answer the question but I think it may help you to understand

Jan 30, 2015
#2
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Thanks for the help.

I just dont understand why you use π/6?

How do you know that θ = π/6?

Jan 30, 2015
#3
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$$\\\theta = 30 degrees\\\\ 180\;degrees = \pi\; radians\qquad This is something you need to know\\ so\\ 1 \;degree = \frac{\pi}{180}\;radians\\ so\\ 30\;degrees=30\times\frac{\pi}{180}\;radians\\\\ 30\;degrees=\frac{\pi}{6}\;radians\\$$

Jan 30, 2015
#4
+5