eng Science and Education Publishing American Journal of Software Engineering 2014-05-22 2 1 13 15 10.12691/ajse-2-1-3 AJSE2014213 article Chii-Huei Yu chiihuei@mail.nju.edu.tw 1 Department of Management and Information, Nan Jeon University of Science and Technology, Tainan City, Taiwan This paper studies three types of definite integrals. The infinite series forms of these definite integrals can be obtained using Parseval's theorem. In addition, we provide some examples to do calculation practically, and Maple is used to calculate the approximations of some definite integrals and their solutions for verifying our answers. http://pubs.sciepub.com/ajse/2/1/3/ajse-2-1-3.pdf definite integrals infinite series forms Parseval��s theorem Maple