eng Science and Education Publishing International Transaction of Electrical and Computer Engineers System 2014-08-18 2 4 124 127 10.12691/iteces-2-4-3 ITECES2014243 article Chii-Huei Yu chiihuei@nju.edu.tw 1 Department of Information Technology, Nan Jeon University of Science and Technology, Tainan City, Taiwan The present paper uses the mathematical software Maple for the auxiliary tool to study four types of definite integrals. The closed forms of these definite integrals can be obtained mainly using Poisson integral formula. On the other hand, we propose two examples to do calculation practically. The research method adopted in this study is to find solutions through manual calculations and verify the answers using Maple. http://pubs.sciepub.com/iteces/2/4/3/iteces-2-4-3.pdf definite integrals closed forms Poisson integral formula Maple