Question

Find the power series for the following and determine the radius of convergence. f(x) = cosx
AWARD GIVEN AT END!

Answer 1

Normally I understand these, this problem has me baffled though..:/

Answer 2

you can find a series for cos x using Mclaurans theorem

Answer 3

do you know the Mclaurans expansion ?

Answer 4

http://blogs.ubc.ca/infiniteseriesmodule/units/unit-3-power-series/taylor-series/the-maclaurin-expansion-of-cosx/

Answer 5

So The Maclaurin series expansion for cos x is cos x=1-x^2/2+x^4/4!-x6/6!+x^8/8! ?

Answer 6

the liable link will tell you