This week we basically went over our study guides for our exams and took the exam. Some other stuff we did was start a new chapter 10 section 1. Chapter 10 we are not allowed to use our calculators. So for this chapter we wil have to know all the formulas. Some other things you might want to know is the trig chart. If you know to trig chart you will probably do pretty good.

Here are some of the formulas we have to know:

-cos(alpha+/- beta) = cos(alpha) cos(beta) -/+ sin(alpha) cos(beta)
-sin(alpha +/- beta) = sin(alpha) cos(beta) +/- cos(alpha) sin(beta)

Ex: Find the exact value of sin 15

alpha= 45
beta= 30

sin(45-30)= sin45 cos30- cos45 sin 30

(square root)of2/2 (square root)of3/2 -( square root) of2/2 1/2

(square root) of6/4- (square root) of2/4 = (square root) of 6-2/

These are some of the things that we covered this week and the new chapter we started.