TÖNISSON, E.; LEPP, M. Students’ Comparison of Their Trigonometric Answers with the Answers of a Computer Algebra System in Terms of Equivalence and Correctness. R&E-SOURCE, [S. l.], v. 1, 2014. Disponível em: https://journal.ph-noe.ac.at/index.php/resource/article/view/85. Acesso em: 28 apr. 2024.