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Let a , b , c , d , e ,f in R such that...

Let `a , b , c , d , e ,f in R` such that `a d+b e+cf=sqrt((a^2+b^2+c^2)(d^2+e^2+f^2))` Use vector to prove that `(a+b+c)/(sqrt(b^2+b^2+c^2))=(d+e+f)/(sqrt(d^2+e^2+f^2))`

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