Question

express z=1+2i/1-3i in polar form​

Answer 1

z = 1 + 2i / 1 - 3i × 1 + 3i / 1 + 3i

= 1 + 3i + 2i - 6 / 1 + 9

= 5i - 5 / 10

= 5 ( i - 1 ) / 10

$= \: - \frac{1}{2} + \frac{1}{2}i$

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