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Factorise the following algebraic expressions using suitable identity.
(i) \(x^4 - y^4 =\)
(ii) \(4x^2 - 9y^2 =\)
(iii) \(x^2 - 8x + 16 =\)
Answer variants:
\((x - 4)^2\)
\((x + 4)(x - 4)\)
\((x^2 + y^2)(x + y)(x - y)\)
\((2x - 3y)^2\)
\((x + y)^2(x + y)(x - y)\)
\((2x + 3y)(2x - 3y)\)
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