Factorise (l + m) ^ 3 + (2m + 3n) ^ 3 + (3n + 4l) ^ 3 - 3(l + m) * (2m + 3n) * (3n + 4l)
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Answer is in the pic above...
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(lm+ 5mn +7nl) (Im ² + 25 m²n² + 49m²l² - 5lm²n-35mm 7nl²m)
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