WOLFRAM
|
DEMONSTRATIONS PROJECT
A Special Case of the Sum of Two Cosines
α
0
.
2
k
3
c
o
s
(
α
)
+
c
o
s
(
3
α
)
2
c
o
s
(
α
)
c
o
s
(
2
α
)
T
h
i
s
D
e
m
o
n
s
t
r
a
t
i
o
n
i
l
l
u
s
t
r
a
t
e
s
t
h
e
f
o
r
m
u
l
a
c
o
s
(
k
α
)
+
c
o
s
(
(
k
-
2
)
α
)
=
2
c
o
s
(
(
k
-
1
)
α
)
c
o
s
(
α
)
.
