If \( \left(\frac{1-i}{1+i}\right)^{m}=1 \), then the least positive integral value
of ' \( m \)....
If \( \left(\frac{1-i}{1+i}\right)^{m}=1 \), then the least positive integral value
\( \mathrm{P} \)
of ' \( m \) ' is
(1) 1
(2) 2
(3) 3
(4) 4
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