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The expression ((cos A-cos B)/(sin A-sin...

The expression `((cos A-cos B)/(sin A-sin B))^m+((sin A+sin B)/(cos A-cos B))^m` where `m in N ` has the value- a.`2cot^m((A-B)/2),\ if\ m\ i s\ od d` b. `0,\ if\ m\ i s\ od d` c. `2cot^("m")((A-B)/2),\ if\ m\ i s\ e v e n` d. `0,\ if\ m\ i s\ e v e n`

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