How to scale graphs of sine and cosine functions?

I know how to find the amplitude and shifts.

I need help understanding how to scale the graphs and where the period actually is.

Please help, I'm confusing myself too much.

***Upon finding all the values, such as amp, the period and any shifts, how would I know how to graph the actual graph, and more importantly, to scale the horizontal axis?

Question

How to scale graphs of sine and cosine functions?

I know how to find the amplitude and shifts.

I need help understanding how to scale the graphs and where the period actually is. 

Please help, I'm confusing myself too much. 

***Upon finding all the values, such as amp, the period and any shifts, how would I know how to graph the actual graph, and more importantly, to scale the horizontal axis?

anonymous · Answer

http://www.purplemath.com/modules/grphtrig.htm