Going back to Chapter 10 because I know I did not remember this to well for the exam. You couldn't use calculators for most of this chapter, but you really didn't need them if you knew your trig chart. 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
** If you don't understand where the 0, 1/2, 1, and square root of 3/3 is coming from.. it's coming from you sin and cos of the degrees on the trig chart.
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