Shoutbox

i dont think this can be done by parts. i tried using it, but the expression we get inside the second integration sign is even more complicated than the question itself.
i tried substituting different forms of the expression, that hasnt helped me yet. i tried adding and substrating different terms like (x^3+1/x^3) to get some sort of differentiable term, but with not much success.
i even tried substituting trigonometric properties, but that doesnt help either.