Simplify and express the result in the form of \( a+b i \) (a) \( \...

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Simplify and express the result in the form of \( a+b i \)
(a) \( \left(\frac{1+2 \mathrm{i}}{2+\mathrm{i}}\right)^{2} \)
\( \mathrm{P} \)
W
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