The research app for trigonometric functions, can be used to analyze independantly the interrelations between term and graph of a sine or cosine function.

In the middle of the app you can view the appearance and the position of the output graph (dashed) and change simultaneously to observe the effects on the parameters of the functional equation in the upper part of the app. In the meantime, in the upper part of the app you can change the parameters of the functional equation and simultaneously observe the effects on the function graph in the middle of the app.