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Verify : (i) x^(3)+y^(3)=(x+y)(x^(2)-xy+...

Verify : (i) `x^(3)+y^(3)=(x+y)(x^(2)-xy+y^(2))`
(ii) `x^(3)-y^(3)=(x-y)(x^(2)+xy+y^(2))`

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