If a = cos theta + isin theta , then f...

If ` a = cos theta + isin theta ` , then find the value of `(1 +a)/(1-a)` then z =` - ibar(z)` .

A

`cot theta`

B

`cot "" theta/2`

C

`i cot ""theta/2`

D

`i tan ""theta/2`

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The correct Answer is:

C

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