SOLUTION: Hi All, Please can someone help Derive the Maclaurin series for sin x as sin x = x -x^3/3!+x^5/5! - ... Hence write down the Maclaurin series for x sin x and sin 3x. Th

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Hi All, Please can someone help Derive the Maclaurin series for sin x as sin x = x -x^3/3!+x^5/5! - ... Hence write down the Maclaurin series for x sin x and sin 3x. Th      Log On


   



Question 380324: Hi All, Please can someone help

Derive the Maclaurin series for sin x as
sin x = x -x^3/3!+x^5/5! - ...
Hence write down the Maclaurin series for x sin x and sin 3x.
Thank You

Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Note the definition of a power series
(sorry, I can't put the f "prime" in without an error message being displayed)
If f(x) = sin x then its derivatives are:
f%28x%29+=+sin+x
f%5E%281%29%28x%29+=+cos+x
f%5E%282%29%28x%29+=+-sin+x
f%5E%283%29+%28x%29+=+-cos+x
f%5E%284%29+%28x%29+=+sin+x
etc.
The Maclaurin series is pretty much the same as a Taylor series except that it is centered around 0. Using the power series definition, we have

sin+x+=+1+-+%281%2F3%29+%28x%5E3%29+%2B+%281%2F5%29+%28x%5E5%29+%2B+...