If tan beta=costhetatanalpha then tan^2(...

If `tan beta=costhetatanalpha` then `tan^2(theta/2)`=

A

`(sin(alpha+beta))/sin(alpha-beta)`

B

`(cos(alpha-beta))/cos(alpha+beta)`

C

`(sin(alpha-beta))/sin(alpha+beta)`

D

`(cos(alpha+beta))/cos(alpha-beta)`

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