González-Quito, E.R., García-Herrera, D.G., Erazo-Álvarez, C.A. and Erazo-Álvarez, J.C. 2020. Khan Academy: Methodological strategy for the education of the graphic of trigonometric functions. EPISTEME KOINONIA. 3, 6 (Jul. 2020), 78–101. DOI:https://doi.org/10.35381/e.k.v3i6.816.