P. 167, lines -4,-3 and -2
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The derivatives should be:
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \frac{d^2f}{dt^2}(t) = \frac{6 t^2}{(1+t^2)^3 - \frac{2}{(1+t^2)^3}}