[((cos A+cos B)/(sin A-sin B))^(n)+((sin...

[((cos A+cos B)/(sin A-sin B))^(n)+((sin A+sin B)/(cos A-cos B))^(n)," (n even or odd) is equal to "],[[" A) "2tan^(n)((A-B)/(2))," B) "2cot^(n)((A-B)/(2))," C) "0," D) none of these "]]

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