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
=
cos
(
a
x
)
a = 1.0
=
cos
(
x
)
y
=
b
sin
2
(
x
)
+
c
cos
2
(
x
)
+
d
b = 1.0
c = 1.0
d = 1.0
=
sin
2
(
x
)
+
cos
2
(
x
)
+
1
y
=
cos
(
x
)
y
=
sin
2
(
x
)
+
cos
2
(
x
)
+
1