What is the common denominator of 1/a + 1/b in the complex fraction (1/a-1/b ) / (1/a+1/b)
a^2 b^2
a – b
a + b
ab

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so it asked to find a common denominator, not the least common denominator?

can i ask you how you would combine the following fractions:
\[\frac{1}{2}+\frac{1}{3}\]

wouldnt you just add them straight across

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