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## Homework Statement

I don't know how to find the square root of a complex number in rectangular form?

As in, say, [tex]\sqrt{}9-6i[/tex]..my calculator can't do such an operation (yet my graphics calculator can, which can't be used in exams), so how do i go about to do this 'by hand'?

I just found this site: http://mathworld.wolfram.com/SquareRoot.html half way down, is that the formula that we use? How do we take the inverse tangent of (x,y)? What's sgn? I've never been taught such a formula nor did I know something like it existed until now...this question is in regards to a third year electromagnetics course and some 3 questions on the tutorials involve square roots of complex numbers..yet i'm assuming the professor found them using a graphics calculator.