What is the indefinite integral of ∫ xtan & # 178; xdx?

What is the indefinite integral of ∫ xtan & # 178; xdx?




Indefinite integral arctan (SiNx / cosx)


arctan(sinx/cosx)
=arctan(tanx)
=x
So its indefinite integral is 1 / 2 * x ^ 2 + C