TÌM NGUYÊN HÀM   2 1 LN X   XDX

Câu 28 (TH): Tìm nguyên hàm   2 1 ln x   xdx .

A.x x 2ln x x 2 2   x C B.x x 2ln x x 2 2   x C

C.x x 2ln x x 2 2   x C D.x x 2ln x x 2 2   x C