this chapterwe will definesix trigonometricfunctions.However, becausethe inputsof thesefunctionsare
angles,in the next two lessonswe will focuson angles.First we will reviewanglesin trianglesfrom Geom-
etry, and then we will consideranglesin rotation.
Pointsto Consider
- Whatdistinguishesa functionfrom a relation?
- Whatmakesa functionperiodic?
- Whatare the pros and consof usinga calculatorto grapha function?
ReviewQuestions
- Determineif eachrelationis a function:
a. (-1,4),(0,3)(1,5),(1,7),(2,15)
b.y= 3 -x
c.
- A train travelsat a constantspeedof 95 milesper hour.
a. Write an equationthat showsthe relationshipbetweenthe numberof hoursthe train has traveledand
the distanceit has traveled.
b. Is this situationdirectvariation,inversevariation,or neither?