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Problem
Problem
If
cos
5
θ
=
a
cos
5
θ
+
b
cos
3
θ
+
c
cos
θ
\cos 5\theta = a \cos^5 \theta + b \cos^3 \theta + c \cos \theta
cos
5
θ
=
a
cos
5
θ
+
b
cos
3
θ
+
c
cos
θ
. Then, find the value of
c
c
c
.
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