Approximation for -1 exponent expression

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SUMMARY

The forum discussion centers on the approximation of the expression [1+H(t-t_0)- \frac{1}{2}qH^2(t-t_0)^2]^{-1} using the Binomial theorem. The approximation simplifies to 1 + H(t_0-t) + \frac{1}{2}qH^2(t-t_0)^2 + H^2(t-t_0)^2. The discussion emphasizes the application of the Binomial theorem, specifically the rule 1/(1 + x) = 1 - x + x^2, to derive this approximation effectively.

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PhyPsy
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How do you come up with this approximation?

[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

Is there a rule that leads to this approximation?
 
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Use the Binomial theorem.

1/(1 + x) = 1 - x + x^2 ...
 

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