n
2
f
u
n
c
t
i
o
n
s
i
n
c
o
s
s
i
n
(
2
x
)
=
I
m
2
e
x
p
(
x
)
=
I
m
2
(
c
o
s
(
x
)
+
s
i
n
(
x
)
)
=
2
s
i
n
(
x
)
c
o
s
(
x
)
