Resumen de Without derivatives or limits: from visual and geometrical points of view to algebraic methods for identifying tangent lines

L. Vivier

• Usually, the tangent line is considered to be a calculus notion. However, it is also a graphical and an algebraic notion. The graphical frame, where our primary conceptions are conceived, could give rise to algebraic methods to obtain the tangent line to a curve. In this pre-calculusperspective, two methods are described and discussed according to their potential for secondary students and teacher training.