What have you tried so far?. These problems are just routine knowing the corresponding theory.
I'll show you how to do one, then you try to do the other...
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Note that this complex number is in the third quadrant. The angle in the first quadrant is .
So the angle in the third quadrant, .
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There are always three cube roots, and they are of the same magnitude and evenly spaced about a circle. So they differ by an angle of .
So the other solutions are
and .
But since , we rewrite this as
and .