If (a+b+c+d) : (a+b−c−d) = (a−b+c−d) : (a−b−c+d) , Let Us Prove That , A : B = C : D. - ConceptEra

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If (a+b+c+d) : (a+b−c−d) = (a−b+c−d) : (a−b−c+d) , let us prove that , a : b = c : d.

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