If costheta=(cosalpha-cosbeta)/(1-cosalp...

If `costheta=(cosalpha-cosbeta)/(1-cosalphacosbeta)`, then the values of `tan(theta/2)` is

A

`cot(beta/2)tan(alpha/2)`

B

`tanalphatan(beta/2)`

C

`tan(beta/2)cot(alpha/2)`

D

`tan^2(alpha/2)tan^2(beta/2)`

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