Question

Find the integral xtan(4x) dx

Answer 1

Try integration by parts.

Answer 2

I did and I got stuck

Answer 3

That is,\[\int u(x)v'(x)\,dx=u(x)v(x)-\int u'(x)v(x)\,dx.\]

Answer 4

i already know that i just am stuck on a certain part

Answer 5

On which part are you stuck?

Answer 6

I get x ln(sec(4x)/4) then im stuck after that

Answer 7

i need the integral at ln(sec(4x)/4)

Answer 8

I believe you mean \(\frac14\ln\cos4x\).

Answer 9

no i mean what i typed