2. Ja (x+5)2+1 dx (try u = (x + 5)2+1) 3. Sa (x-22 3 dx (try u = (x - 2)2 -3) 4. Ja (x+5)2 1 dx (try u = x + 5 and don't forget the derivative of arctan. What makes u = (x + 5)2+ 1 not so helpful?) 5. Ja7 (2 +5) 2+1 -dx (note that x = x + 5 -5 and use the previous integrals)