SOLUTION: 1/a-b - 3ab/a^3-b^3

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Question 321263: 1/a-b - 3ab/a^3-b^3
Answer by mananth(16946) About Me  (Show Source):
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1/a-b - 3ab/a^3-b^3
LCM = a^3-b^3
..
a^2+ab+b^2-3ab / a^3-b^3
a^2-2ab+b^2 / a^3-b^3
(a-b)^2 / (a-b)(a^2+ab+b^2)
(a-b) / (a^2+ab+b^2)