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Mathematics, 19.08.2020 22:01 123333333545

If $z1 = 3(cos\frac{2\pi }{3} + isin\frac{2\pi }{3})$ and $z2 = 4(cos\frac{\pi }{6} + isin\frac{\pi }{6})$ then the argument of z1 z2 = _.

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