P. 167, lines -4,-3 and -2

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The derivatives should be:

\frac{df}{dt}(t) = -\frac{2t}{(1+t^2)^2}

\frac{d^2f}{dt^2}(t) = \frac{6 t^2}{(1+t^2)^3} - \frac{2}{(1+t^2)^3}

\frac{d^3 f}{d t^3}(t) = -\frac{24 t^3}{(1+t^2)^4} +\frac{24 t}{(1+t^2)^4}

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