Trigonometry
[1-cosA+cosB-cos(A+B)]/[1+cosA-cosB-cos(A+B)] = tan(A/2) cot(B/2)
[1-cosA+cosB-cos(A+B)]/[1+cosA-cosB-cos(A+B)] = tan(A/2) cot(B/2)
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Saurabh Koranglekar
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Vikas TU
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