1. Solving Trig Equations
Lesson 5-5:
Solving Trig Equations
VOCABULARY
Inverse trig functions
Arcsine
Arccosine
Arctangent
LEQ - How do you solve for missing angles of right triangles?

2. Can you find the missing pieces….4 B C 3

3. What are the signs of the trig functions in each quadrant?

8. INVERSE TRIG FUNCTIONS SOLVE FOR ANGLES
Each of the problems before can be rewritten as an inverse:
INVERSE TRIG FUNCTIONS SOLVE FOR ANGLES
FUNCTION INVERSE
sin(x) sin-1(x) or arcsin(x)
cos(x) cos-1(x) or arccos(x)
tan(x) tan-1(x) or arctan(x)

9. Assume all angles are in QI.

12. 10
Solve for x: x 8

13. Solve for x: 6 x 7

14. TOTD….
On a slip of paper, draw a right triangle with some given lengths or angle measures. Label at least 2 unknowns on the triangle (angles or sides.)
Now swap papers with your neighbor for them to solve the missing pieces SHOWING THE TRIG FUNCTION USED!!

15. 5-4 / 5-5 Practice Review Problems