Sorry to bother you again so soon but this is another question I became stuck on.

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Consider the complex number:

Find the and

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Man, that LaTeX thing is hard to use!

Anyway this is what I have done so far:

No idea what is so I can't continue...

Maybe this is the wrong way - perhaps instead of tranforming them into numbers, I use cis instead:

becomes and from there, use cis properties...

Anyway, this question has got me completely confused and so I'm finding it rather difficult to continue.

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Could somebody please help me please? Thanks - all help is, of course, appreciated.

PS: How do you guys manage to type up that LaTeX thing smoothly? It takes me ages to get it right! (my first time!)