kmart(: Blogggg

In this blog, i will be going over Chapter 10-1. We can't use calculators in this chapterrrr, yuckk! It was pretty easy though, i got the hang of it pretty quickly.


Formulas:
1) cos(alpha+-beta)=cos(alpha)cos(beta)-+sin(alpha)sin(beta)
2) sin(alpha+-beta)=sin(alpha)cos(beta)+-cos(alpha)sin(beta)



Ex: Find the exact value of sin30
First you need to find the values of alpha and beta that either add or subtract to get 30

alpha: 60
beta: 30

sin(60-30)=sin60cos30-cos60-sin30

sin30=(squarerootof 3/2)(squarerootof 3/2)-(1/2)(1/2)
sin30= (3/4)-(1/4)
sin30=1/2 <------ANSWER!

I kind of likedd this section, it was prettyy basic and it was sort of easier to not use a calculator.