hey,

I've got this problem:

[indefinite integral](1/(t^3+t))dt

I've used the partial fractions to split the integral into 2 separate parts, which becomes:

ln|t| +[indefinite integral](t/(t^2 + 1))dt+ C

here I used the integration by parts for the bolded integral, which gives me:

ln|t| + t*arctan(t) + [definite integral](arctan(t))dt + C

and I cannot figure out what is the antiderivative of arctan(t) is?

thanks for the tips,

Tuugii