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Problems
21.
cos
4
x
+
cos
3
x
+
cos
2
x
sin
4
x
+
sin
3
x
+
sin
2
x
=
cot
3
x
21. \frac{\cos 4x + \cos 3x + \cos 2x}{\sin 4x + \sin 3x + \sin 2x} = \cot 3x
21.
sin
4
x
+
sin
3
x
+
sin
2
x
cos
4
x
+
cos
3
x
+
cos
2
x
=
cot
3
x
Mathematics
Problem
21.
cos
4
x
+
cos
3
x
+
cos
2
x
sin
4
x
+
sin
3
x
+
sin
2
x
=
cot
3
x
21. \frac{\cos 4x + \cos 3x + \cos 2x}{\sin 4x + \sin 3x + \sin 2x} = \cot 3x
21.
sin
4
x
+
sin
3
x
+
sin
2
x
cos
4
x
+
cos
3
x
+
cos
2
x
=
cot
3
x
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