Factorise 4(a+b)^2-9(a-b)^2
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4(a+b)^2-9(a-b)^2
4(a^2+2ab+b^2)-9(a^2+2ab-b^2
4(a^2+8ab+4b^2-9a^2-18ab-19b^2
4(a^2-9a^2+8ab-18ab+4b^2+9b^2
(5a-b) (5b-a)
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