Factorise 8a cube +8b cube.
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a^3 + b^3 = (a + b)*(a^2 - ab + b^2)
8a^3 + 8b^3 = (2a + 2b)*(4a^2 - 4ab + 4b^2)
8a^3 + 8b^3 = (2a + 2b)*(4a^2 - 4ab + 4b^2)
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