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If z=r(cos theta+ isin theta), then the ...

If `z=r(cos theta+ isin theta)`, then the value of `(z)/(bar z)+(barz)/(z)` is

A

`cos 2theta`

B

`2 cos 2theta`

C

`2 cos theta`

D

`2 sin theta`

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The correct Answer is:
B
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