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If none of the denominators is zero, pro...

If none of the denominators is zero, prove that.
`((cosA+cosB)/(sinA-sinB))^(n)+((sinA-sinB)/(cosA+cosB))^(n) = {(2cot^(n)((A-B)/(2)), if n "is even"),(0, if n "is odd"):}`.

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