Factorise: 16x 2 – 25y 2 - (4x + 5y) (4x – 5y), Factorise:(x + 2y) 2 – 4 (2x – y) 2 - (5x) (4y – 3x), Factorise: a 4 – 1/b 4 - (a 2 + 1/b 2 ) (a – 1/b) (a + 1/b), Factorise: 9z 2 – x 2 + 4xy – 4y 2 - [(x – 2y) + 3z] [–x + 2y + 3z)], Factorise: 144a 2 – 289b 2 - (12a + 17b) (12a – 17b), Factorise: (2a – b) 2 – 16c 2 - (2a – b + 4c) (2a – b – 4c), Factorise: (x + y) 2 – (a – b) 2 - (x + y + a – b) (x + y – a + b), Factorise: 16 – a 6 + 4a 3 b 3 – 4b 6 - [4 + (a 3 – 2b 3 )] [4 – (a 3 – 2b 3 )], Factorise: (x + 2) 2 – 6(x + 2) + 9 - (x – 1) 2, Factorise: x 2 – y 2 – 4xz + 4z 2 - (x + y – 2z) (x – y – 2z),

Factorisation using identities

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