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[" 35.In it triangle "ABC" ,if "],[qquad...

[" 35.In it triangle "ABC" ,if "],[qquad [1,,],[1+sin A,1+sin B,1+sin C],[sin A+sin^(2)A,sin B+sin^(2)B,sin C+sin^(2)C]|=0],[" Then prove that "/_ABC" is an isosceles triangle."]

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