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(a) If x + y + z=0, show that x ^(3) + ...

(a) ` If x + y + z=0,` show that `x ^(3) + y ^(3) + z ^(3)= 3 xyz.`
(b) Show that ` (a-b)^(3) + (b-c) ^(3) + (c-a)^(3) =3 (a-b) (b-c) (c-a)`

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