Actually I meant 'integration by parts'

I still think this does not have a "closed form" solution but I will check further.

What is "partial integration"?

At any rate, x = u^2 leads to dx = 2udu and 2*int[u*tan(u)] du which is not possible with standard functions.

Actually I meant 'integration by parts'

What is "partial integration"?

At any rate, x = u^2 leads to dx = 2udu and 2*int[u*tan(u)] du which is not possible with standard functions.