Forrás: http://www.tankonyvtar.hu/hu/tartalom/tamop412A/2011-0023_Matematika_1/data/h1-00-05-07.html

[url=https://socratic.org/questions/how-do-you-find-the-tangent-lines-of-parametric-curves]Forrás:[/url][br]Show that the curve with parametric equations x=sint, y=sin(t+sint) has two tangent lines at the origin and find their equations. Illustrate by graphing the curve and its tangents.