find the factorise 4(a+b)²-(c+d)²
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4(a+b)^2 - (c+d)^3
= 4a^2 + 4ab + 4b^2 - c^2 - 2cd - d^2
4(a+b)^2 - (c+d)^3
= 4a^2 + 4ab + 4b^2 - c^2 - 2cd - d^2
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