For $u=\dfrac7{13}+\dfrac{22}{13}i$ , find the argument of $u$ in degrees.

Model answer

72.3 degrees

Also accepted: 72.3, 72 degrees

Explanation:

\arg(u)=\tan^{-1}\!\left(\dfrac{22}{7}\right)\approx72.3^\circ

Derived from ZIMSEC Pure Mathematics Paper 2, November 2025, Q4

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