# Thread: find the sum of the series (taylors fomula)

1. ## find the sum of the series (taylors fomula)

find the sum of the given series. give answer in simplest form.

heres the equation: http://img255.imageshack.us/img255/1669/untitledfa5.jpg

this looks like its associated with the taylor's formula
need help with this one please.

2. Originally Posted by rcmango
find the sum of the given series. give answer in simplest form.

heres the equation: http://img255.imageshack.us/img255/1669/untitledfa5.jpg

this looks like its associated with the taylor's formula
need help with this one please.
The series,
$\sum_{n=0}^{\infty} \frac{(-1)^n x^{2n}}{(2n)!}$
Is the series for $\cos x$.
Thus, we simply have $x=\pi$.
Thus,
$\cos \pi = -1$