simplify (a+b)^-1(a^-1+b^-1)
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Step-by-step explanation:
(a + b)^-1 X (a^-1 + b^-1) = 1/(a + b) X (1/a + 1/b)
= 1/(a + b) X [(a + b)/ab]
= 1/ab
= (ab)^-1
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