If X : A = Y : B = Z : C , Let Us Prove That–(a²+b²+c²)(x²+y²+z²) = (ax+by+cz)² - ConceptEra

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If x : a = y : b = z : c , let us prove that–(a²+b²+c²)(x²+y²+z²) = (ax+by+cz)²

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