Confusion in understanding Taylors theorem.

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SUMMARY

Taylor's theorem can indeed be utilized to expand f(a-h) in terms of f(a) and its derivatives over the interval (a-h, a). By defining g(x) = f(2a - x), one can express g(a + h) as f(a - h) and subsequently apply Taylor's theorem to g. Additionally, an alternative method involves replacing the coefficients of odd powers of h in the Taylor expansion with their negatives to achieve the desired expansion.

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AAQIB IQBAL
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I know that Taylors theorem is used to expand f(a+h) in terms of f(a) and its derivatives in the interval (a,a+h), but my question is that can we use it to expand f(a-h) in terms of f(a) and its derivatives over the interval (a-h,a).
If yes please give reason.
 
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Hi AAQIB IQBAL! :smile:

Define g(x) = f(2a - x), so g(a + h) = f(a - h),

and then apply Taylor's theorem to g :wink:
 
Or- replace the coefficients of odd powers of h, in the expansion of x+h with their negatives.
 

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