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If cosA = mcosB, then (1) cot((A+B)/2)...

If `cosA = mcosB`, then (1) `cot((A+B)/2) = (m+1)/(m-1) * tan((B-A)/2)` (2)`tan((A+B)/2) = (m+1)/(m-1) * cot((B-A)/2)` (3)`cot((A+B)/2) = (m+1)/(m-1) * tan((A-B)/2)` (4)`tan((A-B)/2) = (m+1)/(m-1) * cot((B-A)/2)`

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