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(cos(A+B))/(cos(A-B))+(cos(C-D))/( cos(C...

`(cos(A+B))/(cos(A-B))+(cos(C-D))/( cos(C+D))=0=>cot A cot B Cot C =`

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(cot A cos A)/(cot A+cos A)=(cot A-cos A)/(cot A cos A)