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[" T.If in a triangle "ABC,(bc)/(2cos A)...

[" T.If in a triangle "ABC,(bc)/(2cos A)=b^(2)+c^(2)-2bc cos A" ,then "],[" the triangle must be "],[[" (a) isosceles "," (b) right angled "],[" (c) equilateral "," (d) can't say anything "]]

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