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If a=costheta+isintheta, then (1+a)/(1-a...

If `a=costheta+isintheta,` then `(1+a)/(1-a) ` is: `(a)`. `cot(theta/2)` `(b)`. `cottheta` `(c)`. `icot(theta/2)` `(d)`. `itan(theta/2)`

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