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a2+b2+c2=x2+y2+z2

divide each side by 2

(a2+b2+c2)/2=(x2+y2+z2)/2

a+b+c=x+y+z

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Q: If a plus b plus c equals x plus y plus z then prove a2 plus b2 plus c2 equals x2 plus y2 plus z2?
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