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I am trying to solve this follow problem, but don't quite know how to go about getting Arg(z).

z = 6 / (1 + 4i)

I got that lzl is sqrt((6/17)^2+(-24/17)^2) but am stuck with finding Arg(z). It told me to recall that -pi < Arg(z) <= pi

Can you guys teach me how to go about finding arrrggg... this Arg(z)?

TIA.

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# Complex analysis

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