We did not learn to much new material this week. We had a chapter test this week on chapter ten, and had a sub for two days, the wonderful Ms. FeFe. I missed two days this week, which sort of put me behind, and for this reason i feel i didnt do to well with this chapter. We could ask questions on problems we were not sure how to do. This chapter only had 4 sections in it, and out of them the first section was definately the easiest. There were only two formulas to learn. It was pretty basic math, and calculators were still not allowed. Still had to know the trig chart if you had any intentions of finishing a problem.
The two formulas were for sin and cos:
Sin ( alpha + beta ) = ( sinalpha ) ( cosbeta ) + ( cosalpha ) (sinbeta)
Cos ( alpha + beta ) = ( cosalpha ) ( cosbeta ) – ( sinalpha ) (sinbeta )
Example:Find the exact value of cos 150
Cos ( 90 + 60 ) = cos90 cos60 – sin90 sin60
(0)(1/2) – (1)(square root 3/3)
0 – square root 3/3
Answer: Square root3/3
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