1. February 13 th copyright2009merrydavidson

2. Inverse functions switch the x and y values. The inverse is NOT a function. y = arcsin x y = sin -1 x 4.7Inverse Trig Graphs

3. Cosine y = arccos x y = cos -1 x The inverse is NOT a function.

4. Tangent y = arctan x y = tan -1 x The inverse is NOT a function.

6. The sine of 30 0 is what? 4.7Inverse Trig Functions 1/2 Let’s go backwards. What angle has a sine of ½? When you are finding the angle you are using inverse trig functions or arc trig functions. What about co-terminal angles? ( )+360n 30 0, 150 0

7. Find the angle in degrees whose sine is: STEPS: Determine the quadrants (All Students Take Classes). Find the angle(s). Add on the tag. QI,II 30 0 +360n 150 0 +360n QI,II 60 0 +360n 120 0 +360n This is how we write the problem.

8. At what angle is the sine equal to 2? Never, because the range for sine is [-1,1].

9. Find the angle in degree measure QI,IV 45 0 +360n 315 0 +360n QIII,IV 240 0 +360n 300 0 +360n

10. Find the angle in radian measure Quadrantal angleQ I,IV Q II,IV Use the correct period!

11. HW: WS 8-3