Tìm I = tích phân (x-2sinx) dx / cos^2 x. I = x tanx + 1/cos^2 x + 2 / cos x +C

I=xtanx+1cos2x+2cosx+C

I=xtanx+lncosx+2cosx+C

I=xtanx+lncosx-2cosx+C

I=xtanx-1cos2x-2cosx+C