This week we really did not learn much new. We had a chapter test this week on chapter 10, and had a sub for two days. We continued to perfect chapter 10 in the beginning of the week and 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 easiest. There was only two formulas that we had to learn and it was pretty basic just substituting. 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
Square root3/3
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