If sqrt(1-c^(2))=nc-1andz=e^(itheta)," t...

If `sqrt(1-c^(2))=nc-1andz=e^(itheta)," then "(c)/(2n)(1+nz)(1+(n)/(z))` is equal to :

A

`1-c""costheta`

B

`1+2c""costheta`

C

`1+c""costheta`

D

`1-2c""costheta`

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The correct Answer is:

C

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