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" 3.If "x+y+z=8" and "xy+yz+zx=20" ,find...

" 3.If "x+y+z=8" and "xy+yz+zx=20" ,find the value of "x^(3)+y^(3)+z^(3)-3xy

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If x+y+z=8 and xy+yz+zx=20 find the value of x^(3)+y^(3)+z^(3)-3xyz

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