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2015-06-29T11:52:59+05:30

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Maximum value of sin Ф is 1.
So sinA+sinB+sinC=3 means 
sin A = 1
sin B = 1
sin C = 1
Thus, A = B = C = 90 degree

cos A = cos 90 = 0
cos B = cos 90 = 0
cos C = cos 90 = 0

cos A + cos B  +cos C = 0
1 5 1