1.

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

Answer»

`(SIN (alpha+beta))/(sin (alpha-beta))`
`(sin(alpha-beta))/(sin (alpha+beta))`
`(COS (alpha+beta))/(cos (alpha-beta))`
`(cos(alpha-beta))/(cos (alpha+beta))`

ANSWER :A


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