اضافة جديدة في استنباط التكاملات المحددة

We propose a new method to derive definite integrals. The method is based on representation of signals (or functions) in two reciprocal domains .This is because the signals are represented by Fourier Transform, F.T. which is defined as integral formula. The proposed method is relatively simple but it is a powerful tool to construct a big library of definite integrals, and to expand the library horizontally and vertically without any theoretical limits. In horizontal expansion (discussed here) we try to use the different properties and theories of F.T., and if we consider a set of N primary functions, we can derive multiple N of definite integrals .The appendices include some results which can be considered as examples to different cases in text.