1.

If cos theta=(cosalpha-cos beta)/(1-cosalpha cos beta), then one of the vlaues of tan((theta)/(2)) is

Answer»

`COT""(BETA)/2TAN""(alpha)/2`
`tanalphatan""(beta)/2`
`TAN""beta/2cot""alpha/2`
`tan^2""alpha/2tan""beta/2`

Answer :A


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