From the trigonometric values for various angles, the following graphs can be drawn. The graphs are usually shown between 0**°**and 360**°**, but can be continued for angles less than 0**°** and greater than 360**°**.

(a) y = sin x

Click Here to see the graph of y = sinx being formed.

Click Here to see the graph of y = cosx being formed.

Click Here to see the graph of y = tanx being formed.

- These graphs have a regular pattern and so are called
**periodic**functions. - The maximum value of the sine and cosine graphs is 1 and the minimum value is -1.
- The tangent graph has asymptotes at 90
**°**and 270**°**. i.e. tan 90**°**and tan 270**°**are said to be undefined.

As the angle gets closer to 90**°**and 270**°**the value of the tangent tends towards infinity ().