I use a website called integral of the day, all the previous ones have answers, but todays I cannot ind an answer for and no online calculators can do it either.
I use a website called integral of the day, all the previous ones have answers, but todays I cannot ind an answer for and no online calculators can do it either.
Even simpler integral: \int \frac{\tan (x)}{x} dx does not have finite closed-form expression in terms of very large class of special functions.
