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Complex Numbers — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHSComplex Numbers1 Mark
Question
Write the argument of -i.
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Answer

Let $\text{z}=-\text{i}$ Then, $\text{Re(z)}=0,\text{Im(z)}=-1$ Since, the point (0,-1) representing z = 0 -i lies on negative direction of imaginary axis.Therefore, $\text{arg(z)}=-\frac{\pi}{2}$ or $\frac{3\pi}{2}$

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