verify that . x³+y³+z³-3xyz=½(x+y+z)[(x-y)²+(y-z)²+(z-x)²].
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Answer:
x-y2=x2-2xy+y2
y-z2=y2-2yz+z2
z-x2=z2-2zx+x2
1/2=2/2cancelled(common factor)
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