simplify (x+y+z)2-(x-y-z)2
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4y+4z will be the answer
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(x+y+z)2-(x-y-z)2
2x+2y+2z-2x+2y+2z
4 y+4 z
4 (y+z)
2x+2y+2z-2x+2y+2z
4 y+4 z
4 (y+z)
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