∫1／（X＾2十2X十2）dX＝

题目

∫1／（X＾2十2X十2）dX＝

答案

∫1／（X＾2十2X十2）dX
=∫1／[(x+1)^2+1]dX
＝∫1／[(x+1)^2+1]d(X+1)
=arctan(x+1) +C