Select the correct answer from the given...

Select the correct answer from the given alternatives. If `z = r (Costheta + i Sintheta)` then the value of `(z /bar z) +(bar z / z)` is …… .

A

a) `Cos2theta`

B

b) `2 cos2theta`

C

c) `2 cos2theta`

D

d) `2 Sintheta`

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