what you should learn
-sketch the graphs of basic sine and cosine functions.
-use amplitude and period to help sketch the graphs of sine and cosine function.
-sketch translations of the graphs of sine and cosine functions.
-use sine and cosine functions to model real-life data.
why you should learn it
sine and cosine function are often used in scientific calculations. for instance,in exercise 87 on page,you can use a trigonometric function to model the airflow of your respiratory cycle.