This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
-8
Step 1: Identify the complex numbers , , and in polar form. The given complex numbers are: These are in the form , where for all three.
Step 2: Apply De Moivre's Theorem to calculate . De Moivre's Theorem states that . For :
Step 3: Apply De Moivre's Theorem to calculate . For :
Step 4: Apply De Moivre's Theorem to calculate . For :
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Identify the complex numbers a, b, and c in polar form.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.