Mathematics, 09.03.2021 07:10, josselynparra22

given -2+4i, express the complex number in polar form. I know the answer is 2 root 5(cos2.03 + isin2.03), but I don't know where the 2.03 comes from. Can someone explain please?

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given -2+4i, express the complex number in polar form. I know the answer is 2 root 5(cos2.03 + isin2...