simplify 64L^3+125m^3
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64L^3+125m^3
= (4L)^3 + (5m)^3
{we know ( a3 + b3 ) = (a + b) (a2 - ab + b2 ). }
= (4L + 5m) (16L^2 - 20mL + 25m^2)
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