I've always been useless with logs, help please! How did they get from line one to line two? Thanks in advance!
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Originally Posted by bluebiro I've always been useless with logs, help please! How did they get from line one to line two? Thanks in advance! Only the two fractions in the bracket are collected: $\displaystyle -\dfrac14\left(\dfrac1{x+1}+\dfrac1{x-1}\right) = -\dfrac14\left(\dfrac{x-1 + x+1}{(x+1)(x-1)}\right) = -\dfrac14\left(\dfrac{2x}{x^2-1}\right) = -\dfrac12\left(\dfrac{x}{x^2-1}\right)$
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