−
x =
1
x
cos
(cos
)
x
For what values of
is
?
−
x =
1
x
cos(cos
)
x
For what values of
is
?
-1
-1
6. Find the exact value of cos
1.
7. Find the exact value of cos
0.
π
7
3
−
−
1
cos
cos
9. Find the exact value of
.
-1
8. Find the exact value of cos
5
2
-1
10. Use a calculator to evaluate cos
0.6 to the nearest hundredths.
Graph the inverse tangent function and state its domain and range.