y = a sin x + b cos x


The figure shows the idea of constructing the function; y = a sin x + b cos x

The angle OAP is always 90 degrees. When the figure OAP rotates arround the origin, the y-coordinate of point P represents the function.


The applet shows the graph of
y = a sin x + b cos x

The initial value of a and b are 1 and 0.5 respectively.

To draw the graph, press "Draw" button.


Using the applet, you can observe the graph of y=a sin x + b cos x is a simple sine curve with the same period in any cases. However, the amplitude and phase shift are different.

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