a) 1 lkdx = 1 irdx = 21^T = 21n|.r+ 1| + C
+ 13dx + 5 | —pr- = \x2 + 3.r + 5 ln|x - 2| + C e) f —5-^—dx = 2 f —— = 2arctg(x- 1) + C
' J x2-2x-r2 • (x-l)2+l '
A—4<0