Please answer me today is my unit test questions no. 12
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as we know, x^3+y^3+z^3-3xyz=(x+y+z)(x^2+y^2+z^2-xy-yz-zx)
=1/2(x+y+z)[2x^2+2y^2+2z^2-2xy-2yz-2zx)]
=1/2(x+y+z)[(x^2+y^2-2xy)+(y^2+z^2-2yz)+(z^2+x^2-2zx)]
=1/2(x+y+z)[(x-y)^2+(y-z)^2+(z-x)^2]
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Foji and call the people who have been working in a few weeks and I have been a long way to the people day Happy to help with me and the other hand I will not w
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