This applet (v6) is suitable for self study.
This applet allows for two trigonometric functions with upper and lower to be introduced using input boxes.
The x axis can be toggled between degrees to radians using a button, and limits set using input box.
This applet lets the user study the various trigonometric functions and impact on changes of the coefficients a, b & c
in trigonometric functions of the form f(x) = a sin(bx) + c ; a sin(bx) + c ; a cos(bx) + c or a tan(bx) + c