Act 1

Verify each identity 1. cot * 0+1 = sec20 3. (csc20 - 1)sin20 = cos20 cot-8 2. 1 + 2 tan 20 = sec+0 - tan 40 tan A+cot A 4. =1 sec A CSC AB. APPLICATION CHECK: Solve the worded problem (10 points) 1. Look back at the model in Example 6 on page 7. On which days of the year are there 10 hours of sunlight in Prescott, Arizona? 2. The tide, or depth of the ocean near the shore, changes throughout the day. The depth of the Bay of Fundy can be modeled by TT d = 35 - 28 cos 62 where d is the water depth in feet and t is the time in hours. Consider a day in which t = 0 represents 12:00 A.M. At what time (s) is the water depth 13 - feet