“Trigonometria_GraficaFunzioni_FREE” app allows you to view all Trigonometric Functions within the Goniometric Circle (Circumference of Radius = 1). By varying the angle (in degrees) through a Slider, a graphics animation presents us the immediate change of angle and individual functions. On some TextBox are shown all the values of these functions. The following 6 pages show only the “Screen shot” of individual functions and their graphical representation: these pages are interactive in the paid version (“Trigonometria_GraficaFunzioni”), which will be published later. The app is very useful for Teachers and Students of Mathematics in High Schools and Universities.