Primitives

i just don't know how to primitivize very well

what should i do when i need to primitivize a fraction

could you please explain me clearly how this function was primitivized?
http://img369.imageshack.us/img369/1093/zzzls4.jpg

>>6
In calculus, an antiderivative, primitive or indefinite integral of a function f is a function F whose derivative is equal to f, i.e., F′ = f. The process of solving for antiderivatives is antidifferentiation (or indefinite integration). They are also called integrals, but this usage is not universally accepted. Antiderivatives are related to definite integrals through the fundamental theorem of calculus, and provide a convenient means for calculating the integrals of many functions.