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If z =1 + cos "" (pi)/(5) + I sin "" (pi...

If `z =1 + cos "" (pi)/(5) + I sin "" (pi)/(5),` then sin (areg z) si equal to

A

`(sqrt (10 - 2 sqrt5))/( 4)`

B

`( sqrt5 - 1)/(4)`

C

`( sqrt5 + 1)/(4)`

D

`( sqrt2 - 1)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
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