\[
z_{1}=\frac{a}{1-i} ; z_{2}=\frac{b}{2+i} ; z_{3}=a-b i \text { for } a, b \in R
\]
if \( z_{... VIDEO
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z_{1}=\frac{a}{1-i} ; z_{2}=\frac{b}{2+i} ; z_{3}=a-b i \text { for } a, b \in R
\]
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