factorise : x^9y^5-x^5y^9
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x^9y^5-x^5y^9
x5y5(x4) -- x5y5(y4)
x5y5 (x4 -y4)
x5y5( [x²]² -[y²]²) x²-y²=[x+y][x-y]
x5y5 ( [x² +y²] [x²- y²])
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