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CBSE Class 9 Answered

If sin A + sin B + sin C = 3, find cos A + cos B + cos C.
Asked by a.behera67 | 20 Oct, 2015, 02:40: PM
answered-by-expert Expert Answer
M a x i m u m space v a l u e space o f space sin e space i s space 1. T h u s space sin A plus sin B plus sin C equals 1 plus 1 plus 1 equals 3 therefore A equals B equals C equals 90 degree rightwards double arrow cos A plus cos B plus cos C equals c o s 90 degree plus c o s 90 degree plus c o s 90 degree equals 0 plus 0 plus 0 equals 0
Answered by Vimala Ramamurthy | 20 Oct, 2015, 03:17: PM

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