Grade 11Trigonometry
Cos(A+B) sin (C+D) = cos (A-B) sin (C-D). To prove CotA Cot B cot C = cot D
Cos(A+B) sin (C+D) = cos (A-B) sin (C-D). To prove CotA Cot B cot C = cot D
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Saurabh Koranglekar
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