Simplify
\[\left( \frac{3 + i \sqrt{3}}{2} \right)^8 + \left( \frac{3 - i \sqrt{3}}{2} \right)^8.\]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify
\[\left( \frac{3 + i \sqrt{3}}{2} \right)^8 + \left( \frac{3 - i \sqrt{3}}{2} \right)^8.\]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-81
Simplify
\[\left( \frac{3 + i \sqrt{3}}{2} \right)^8 + \left( \frac{3 - i \sqrt{3}}{2} \right)^8.\]
train