Hoặc
Xác định nguyên hàm ∫x+3x2+3x+2dx.
A. 2ln|x+2|−ln|x+1|+C.
B. 2ln|x+1|−ln|x+2|+C.
Ta có: ∫x+3x2+3x+2dx=∫2x+1−1x+2dx=2ln|x+1|−ln|x+2|+C.