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The principal value of the arg(z) and l...

The principal value of the arg(z) and lzl of the complex number`z= 1+ cos((11pi)/9)+ i sin((11pi)/9)` are respectively

A

`(11 pi)/(8), 2 cos (pi/18)`

B

`-(7pi)/(18), -2 cos ((11 pi)/(18))`

C

`(2pi)/(9), 2 cos ((7pi)/(18))`

D

`-pi/9, -2 cos ((pi)/(18))`

Text Solution

Verified by Experts

The correct Answer is:
B
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