Complex number z = frac{i-1}{cos(frac{p...

Complex number `z = frac{i-1}{cos(frac{pi}{3})+isin(frac{pi}{3})` in the polar form is

A

`sqrt2(cos(frac{5pi}{12})+isin(frac{5pi}{12}))`

B

`sqrt2(cos(frac{pi}{4})+isin(frac{Pi}{4}))`

C

`sqrt2(cos(frac{pi}{6})+isin(frac{pi}{6}))`

D

none of these

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