Complex number question?

Hi. I'm really stuck:

Solve the equation z^4=64(cosπ + i sin π) giving your answers in polar form.

Many thanks.

2010-03-23T12:57:22Z

How do you get there - what is the working? Thanks.

Anonymous2010-03-23T12:28:54Z

Favorite Answer

z = 2^(3/2) cis (π/4 + kπ/2), k = 0 , 1, -1, -2

10

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