How do you come up with this approximation?(adsbygoogle = window.adsbygoogle || []).push({});

[itex][1+H(t-t_0)- \frac{1}{2}qH^2(t- t_0)^2]^{-1}\approx1+ H(t_0-t)+ \frac{1}{2}qH^2(t-t_0)^2+ H^2(t-t_0)^2[/itex]

Is there a rule that leads to this approximation?

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# Approximation for -1 exponent expression

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