PRESENTATION OUTLINE
SUM AND DIFFERENCE FORMULAS
In order to understand how to solve sum and difference problems you must know prior to this knowledge how to read a unit circle, and the trigametric functions. Especially sine cosine, and tangent. It would make things a lot more simpler if you understood the Pythagorean identities as well in order to simplify.
RULES
- Sin(a+/-b)=sinacosb+/-cosasinb
- Cos(a+/-b)=cosacosb-/+sinasinb
- Tan(a+/-b)=tana+/-tanb\1+/-tanatanb
Your sitting on your chair watching the beautiful sunset in the beach. You want to know the angle of the bottom of the chair is, you figure out its 75 degrees. Now you plug it into the sum and difference formula of sine.
