The slider for [i]C[/i] can be used to explore the impact of the parameter [i]C[/i] on the graph of the sine function or the cosine function.
The red graph is the graph of [i]y[/i] = sin([i]x[/i]) (or [i]y[/i] = cos([i]x[/i])) and remains fixed.
The black graph is the graph of [i]y[/i] = sin([i]x[/i] - [i]C[/i]) (or [i]y[/i] = cos([i]x[/i] - [i]C[/i]) and will change as the value of [i]C[/i] is changed.
