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Show that for any a, b,c integers (a-b-c)^2-(a+b+c)^2+(a+b-c)^2-(a-b+ c)^2 is divisible by 4a

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Show that for any a, b,c integers (a-b-c)^2-(a+b+c)^2+(a+b-c)^2-(a-b+ c)^2 is divisible by 4a...

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