EXAMPLE 4
Use reference angles to evaluate functions
b.
The angle
is coterminal
with
. The reference
angle is
θ' =
π
–
=
.
The cosecant function is
positive in Quadrant II, so you
can write:
17π
6
5π
6
5π
6
π
6
csc
= csc
= 2
17π
6
5π
6