Solving Complex Problems Without Expansion

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How can we solve this without expanding?
 

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Can you please stop posting these doc-documents and use the PF options?
 
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As said before, please don't post in .doc format. If you insist in posting by attachment please refer to a guide I gave to you on your previous thread.

Furthermore if you are doing to post in attachment please at least make it neat, you've written everything in Microsoft Equation Editor, which normally does not allow spaces.

While I'm at it, I'm fairly sure your posts belong more in general maths than number theory.
 

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