I am trying to work out the first four terms for these series

i)e^-2t I get 1 -2t+4t^2/2 -8t^3/3

ii)cos4t Iget = 1-8t^2/2 +256t4/4

Is this right, or can you explain where I am going wrong

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- Mar 18th 2009, 03:14 PMJaffaPower series
I am trying to work out the first four terms for these series

i)e^-2t I get 1 -2t+4t^2/2 -8t^3/3

ii)cos4t Iget = 1-8t^2/2 +256t4/4

Is this right, or can you explain where I am going wrong - Mar 18th 2009, 03:27 PMskeeter
- Mar 18th 2009, 04:00 PMSoroban
Hello, Jaffa!

You're forgetting the factorials . . .

Quote:

Find the first four terms for these series:

. . .

(1) Series: .

We have: .

. . . . . . . . . .

. . . . . . . . . .

(2) Series: .

We have: .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

- Mar 18th 2009, 04:13 PMJaffa
Hello Soroban

Thanks for the help, but I am not sure what you mean by factorials

could you please explain