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Mathematics
Mathematics
Problem
For
0
≤
x
<
2
π
0 \le x < 2\pi
0
≤
x
<
2
π
, how many solutions satisfy
sin
2
x
+
sin
4
x
=
0
\sin 2x + \sin 4x = 0
sin
2
x
+
sin
4
x
=
0
? a)
6
6
6
b)
8
8
8
c)
7
7
7
d)
9
9
9
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