- #1

- 6

- 0

x^2 / (1+x^2).... I've tried using the geometric series, but somehow i got stuck.

thanks.

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- Thread starter yayMath
- Start date

- #1

- 6

- 0

x^2 / (1+x^2).... I've tried using the geometric series, but somehow i got stuck.

thanks.

- #2

shmoe

Science Advisor

Homework Helper

- 1,992

- 1

An alternate method: if you know the series for arctan(x), you can use the fact that it's derivative is 1/(1+x^2).

- #3

- 175

- 0

1/(1-r). So maybe altering your fraction a bit will help you notice it.

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