Precalculus 1-21-10

Unit Circle Day 2

Today, we all learned how to find the value of different problems from the unit circle.
Remember: Change your calculator settings to Radians instead of Degree because the problems won't work otherwise.
1)

To solve this problem, all you need to do is type into your calculator. The answer should be .7431. All answers should usually be rounded to four digits.


2)

I know you all are probably frowning right now because in this problem, there isn't sin, cos or tan which are the no brainers. But, this problem is simple as well! On the unit circle,
cot=. To solve this problem, we are going to use the same formula from the unit circle to get our answer. So, you take the formula and just plug in the numbers 2 and 9 from the original problem. Your final formula will be . Just plug that formula into the calculator and the answer will be 1.1917. :)


3)

There's no pi in this problem, so we can't do it right? Wrong! We all know that in the unit circle, . To solve this problem, all you need to do is what we did in the previous problem. Take the 5 from sec5 and plug in into the formula . Your final formula should be
. Punch the formula into your calculator and your answer should be 3.5253.


I hope these questions help you guys if you are having trouble. If you need any more help, then go onto Mr.Corn's Website Here .