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PART I: A DESCRIPTION OF THE METHOD
Valentina Todorova-Lazarova, Penka Ivanova, Radostin Lefterov
Technical University of Gabrovo, Gabrovo, Bulgaria

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PART II: NEW THEOREMS AND GRAPHICAL REPRESENTATIONS
Valentina Todorova-Lazarova, Penka Ivanova, Radostin Lefterov
Technical University of Gabrovo, Gabrovo, Bulgaria

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Marina Tošić, University of Priština in Kosovska Mitrovica, Faculty of Sciences and Mathematics, Department of Mathematics Kosovska Mitrovica, Republic of Serbia