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- anonymous

what does sequence have to do with trig?

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- anonymous

what does sequence have to do with trig?

- jamiebookeater

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- TuringTest

which sequence?

- anonymous

the one with a big ∑

- TuringTest

That's called a series. The symbol is called Sigma
A sequence means you do not add up the terms, a series means you do.
There are a number of series related to trig functions, but I am guessing you mean the Taylor series expansion of sine and cosine...\[\cos x=\sum1-\frac{x^2}{2!}+\frac{x^4}{4!}-\frac{x^6}{6!}+\dots\]\[\sin x=\sum x-\frac{x^3}{3!}+\frac{x^5}{5!}-\frac{x^7}{7!}+\dots\]right?

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- anonymous

something like that
but that goes into calc very fast when i just grabbed a trig book lol
the whole problem when
6
64 ∑ 2 ^-k
k=1
this is what the whole thing (problem) looks like

- TuringTest

Most functions f(x) can be written in terms of Taylor series\[\sum_{n=0}^{\infty}\frac{f^{(n)}(a)}{n!}(x-a)^n\]However the problem you posted\[64\sum_{k=1}^{6}2^{-k}\]is a very different one, and has no relation to trig functions that I personally know of.

- anonymous

:\

- anonymous

it will be a while before i get to taylor series
i only got to limits
i am back tracking on trig

- anonymous

thank you vm

- TuringTest

is that series that I posted second the correct one?

- anonymous

i was just focusing on what you said not the problem itself
that if was or not part of trig at the moment
then i looked at the calc part
so ty very much
:)

- TuringTest

welcome :)

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