Taylor series ln(1 + x^2)

**khuezy** · October 8th 2008, 09:37 AM

ln(1 + x^2)
how would I do this?
Thanks in advance.

**ThePerfectHacker** · October 8th 2008, 09:49 AM

Originally Posted by khuezy

ln(1 + x^2)
how would I do this?
Thanks in advance.

Remember $\ln (1 + t) = \sum_{n=0}^{\infty} \frac{(-1)^n t^n}{n}$ for $|t|<1$ .

Therefore if $x^2 < 1$ then $\ln (1+x^2) = \sum_{n=0}^{\infty} \frac{(-1)^n x^{2n}}{n}$

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