Factorise the following-
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xy((xy)^2 -(5/z)^2)
xy(xy+ 5/z)(xy- 5/z)
xy(xy+ 5/z)(xy- 5/z)
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x³y³-25xy/z²
=xy(x²y²-5²/z²)
=xy(xy)²-(5/z)²
=xy(xy+5/z)(xy-5/z)
=xy(xyz+5)/z * (xyz-5)/z
=xy(x²y²-5²/z²)
=xy(xy)²-(5/z)²
=xy(xy+5/z)(xy-5/z)
=xy(xyz+5)/z * (xyz-5)/z
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