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[" 16.In a "Delta ABC," if "/B=60^(@)" ,...

[" 16.In a "Delta ABC," if "/_B=60^(@)" ,prove that "15" ,then prove that "(cos A)/(2)=(cos B)/(7)=(cos C)/(11)" ."],[" 17.If in a "Delta ABC,cos^(2)A+cos^(2)B+cos^(2)C=1," prove that the triangle is right angle "]

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