The Student Room Group
bio_ray18
Z1= -3+3i

r= sq rt. of 18

Arg(z) = tan theta = 3/(-3) = -1
theta = -1/4 pi

pi - 1/4 pi = 3/4pi

Arg(z) = 3/4pi

Is this the correct answer?


Yes, the answer is correct.
if in doubt draw a quick sketch of the argand diagram (x-axis=real; y-axis=imaginary)

and that way you can confirm if your calculated angle (argument) is sensible

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