Question

what does sequence have to do with trig?

Answer 1

which sequence?

Answer 2

the one with a big ∑

Answer 3

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?

Answer 4

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

Answer 5

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.

Answer 6

:\

Answer 7

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

Answer 8

thank you vm

Answer 9

is that series that I posted second the correct one?

Answer 10

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

:)

Answer 11

welcome :)