2
4
6
−2
−4
−6
1
2
3
−1
−2
−3
−4
0,0
–
o
+
←
↓
↑
→
−
2
π
−
3
π
2
−
π
−
π
2
π
2
π
3
π
2
2
π
y
=
s
e
c
a
(
x
)
a = 1.0
=
sec
(
x
)
y
=
tan
b
(
x
)
+
c
b = 1.0
c = 0.0
=
tan
(
x
)
y
=
sec
(
x
)
y
=
tan
(
x
)