1.

If cos theta = ( cos alpha - cos beta )/(1- cos alpha cos beta ) " then " tan^(2)""((theta )/(2)) tan^(2)""((beta)/(2))=

Answer»

`"tan"(ALPHA)/2`
`"tan"^(2)(alpha)/2`
`"COT"(alpha)/2`
`"cot"^(2)(alpha)/2`

ANSWER :B


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