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Factorise the following : (i) 9a^(2)-b^...

Factorise the following : `(i) 9a^(2)-b^(2) " " (ii) 81x^(3)-x " " (iii) x^(3)-49xy^(2) " " (iv) a^(2)-(b-c)^(2)` `(v) (x-y)^(3)-x+y " " (vi)x^(2)y^(2)+1-x^(2)-y^(2) " " (vii) 25(a+b)^(2)-49(a-b)^(2) " " (viii) xy^(5)-x^(5)y` `(ix) x^(8)-256 " " (x) x^(8)-81y^(8)`

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