Оличка 1) INT xdx/(1+x^2)=1/2 INT d(1+x^2) /(1+x^2). INT e^(arctg x) d arctg x=e^(arctg x) 2) (x^2+2)/((x+1)^2 (x-1))=A/(x-1)+B/(x+1)+C/(x+1)^2