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Question
Write the argument of −i.
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Solution
\[\text { Let z } = - i\]
\[\text { Then , Re }\left( z \right) = 0, \text { Im }\left( z \right) = - 1\]
\[\text { Since, the point (0, - 1) representing z = 0 - i lies on negative direction of imaginary axis } . \]
\[\text { Therefore }, \]
\[\arg (z) = \frac{- \pi}{2} \text { or } \frac{3\pi}{2} \]
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