factories these questions x^9-y^9
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$$\begin{lgathered}{x}^{9} - {y}^{9} \\ = ([{ {x}^{3} }]^{3} ) - ([{ {y}^{3} }]^{3} ) \\ = ( {x}^{3} - {y}^{3} )( {x}^{6} + {x}^{3} {y}^{3} + {y}^{6} ) \\ = (x - y)( {x}^{2} + xy + {y}^{2} )( {x}^{6} + {x}^{3} {y}^{3} + {y}^{6} )\end{lgathered}$$
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