This is a demonstration of the sine function. Remember that \(\sin(\theta)\) is defined to be the \(y\text{-value}\) of the point on the unit circle defined by angle \(\theta\), measured counter-clockwise from the \(x\text{-axis}\). Here’s another way to think of it: \(\sin\theta\) is the projection of the clock hand on the \(y\text{-axis}\).
Click on graph to activate, then use arrow keys.