Integration of rational functions using Partial fractions: Find integral by partial fraction decomposition(a) integral x^2+1/x+1 dx (b) integral 3x/(x+2)(x-3) dx (c) integral 3c/x^2-4 dx (d) integral x^2-11x-18/x(x^2+3x+3) dx (e) integral 7x+3/x^3-2x^2-3