taylor expansion question: what part of the expansion of a function of f(x) in powers of x best reflects the behavior of the function for x's close to 0?
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@KingGeorge can you help me on this question?
Well, if we divide it up into parts where a "part" is the first n terms, I have an idea. However, I would like to see what you think before I start an explanation.
i am really confuse abt this question. i don't know what is ask for
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Well, it's talking about the powers of x. From that, I would make a guess that they want you to say that it's the all the terms up to the \(x^1\)th term.
However, there's no real way to say for sure since this isn't necessarily a McLaurin Series. Thus, it's not necessarily centered at 0, so it really depends on the function.
what if the curve is centered at 0?
However, if we assume it is centered at 0, then let's throw away all the terms except the first two terms. So we have a function that looks like \(T_1(x)=ax+b\). It is precisely correct at \(x=0\) since it's centered at 0, and for very close points, it has nearly the same slope. So for points very close to \(x=0\), this is a good approximation.
is could apply every function if the function is centered at 0?
If it's centered at 0, I would say the first two terms.
If it's not centered at 0, you really can't say anything. However, the best approximation, is the whole Taylor series.
Of course, if you use the whole thing, it shouldn't be an approximation anymore. It would be exactly the same.