1. 13-5 The cosine Function Today’s Objective: I can graph the cosine function.

2. xy 0

3. Domain: Range: Period: Amplitude: All real numbers – 1 ≤ y ≤ 1 2π2π 1 OR How does this graph differ from y = sin x? Translated left by

4. Properties of Cosine Function Sketch the graph of: 5 points: max – midline – min – midline - max

5. What is the cosine function that models the water level in inches as a function of time? Amplitude: Period: 4:40 pm – 10:30 am My boat needs 10 inches above an average water level. When can I bring my boat into this dock? p. 864: 7-19 odd, 27-33

6. What is the cosine function that models the water level in inches as a function of time? Calculator [WINDOW] Xmin = Xmax = Xscl = Ymin = Ymax = Yscl = 0 25 5 – 35 35 5 When is tide 10 inches above average level? p. 864: 7-19 odd, 27-33