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Problems
6.
(
sin
7
x
+
sin
5
x
)
+
(
sin
9
x
+
sin
3
x
)
(
cos
7
x
+
cos
5
x
)
+
(
cos
9
x
+
cos
3
x
)
=
tan
6
x
\frac{(\sin 7 x+\sin 5 x)+(\sin 9 x+\sin 3 x)}{(\cos 7 x+\cos 5 x)+(\cos 9 x+\cos 3 x)}=\tan 6 x
(
c
o
s
7
x
+
c
o
s
5
x
)
+
(
c
o
s
9
x
+
c
o
s
3
x
)
(
s
i
n
7
x
+
s
i
n
5
x
)
+
(
s
i
n
9
x
+
s
i
n
3
x
)
=
tan
6
x
Mathematics
Problem
6.
(
sin
7
x
+
sin
5
x
)
+
(
sin
9
x
+
sin
3
x
)
(
cos
7
x
+
cos
5
x
)
+
(
cos
9
x
+
cos
3
x
)
=
tan
6
x
\frac{(\sin 7 x+\sin 5 x)+(\sin 9 x+\sin 3 x)}{(\cos 7 x+\cos 5 x)+(\cos 9 x+\cos 3 x)}=\tan 6 x
(
c
o
s
7
x
+
c
o
s
5
x
)
+
(
c
o
s
9
x
+
c
o
s
3
x
)
(
s
i
n
7
x
+
s
i
n
5
x
)
+
(
s
i
n
9
x
+
s
i
n
3
x
)
=
tan
6
x
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