If A+B+C=2π then PT cos²B + cos²C - sin²A = 2·cosA·cosB·cosC
If A+B+C=2π then PT cos²B + cos²C - sin²A = 2·cosA·cosB·cosC
Mahendra Tak , 8 Years ago
Grade 12th pass
Trigonometry> If A+B+C=2π then PT cos²B + cos²C - sin²A...
1 Answers
Saurabh Koranglekar
Last Activity: 6 Years ago
Dear student
Please find the link below
https://www.askiitians.com/forums/Trigonometry/prove-that-cos-2-a-cos-2-b-cos-2-c-1-2cosa-cosb-co_198731.htm
Regards
Please find the link below
https://www.askiitians.com/forums/Trigonometry/prove-that-cos-2-a-cos-2-b-cos-2-c-1-2cosa-cosb-co_198731.htm
Regards
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