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(1-costheta+isintheta)/(1+costheta-isint...

`(1-costheta+isintheta)/(1+costheta-isintheta)`

A

`itan""(theta)/(2)`

B

`-itan""(theta)/(2)`

C

`tan""(theta)/(2)`

D

`-tan""(theta)/(2)`

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