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Authors: |
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M. Abdelhakem - Department of mathmatics, Faculty of science, Helwan University, Cairo, Egypt\\ Canadian International College, Cairo, Egypt
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Aya Ahmed - Department of mathmatics, Faculty of science, Helwan University, Cairo, Egypt
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M. El-kady - Department of mathmatics, Faculty of science, Helwan University, Cairo, Egypt\\ Canadian International College, Cairo, Egypt
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