1.

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

Answer»

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

ANSWER :A


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