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Mathematics
Mathematics
Problem
Show that
cos
2
θ
+
cos
2
(
α
+
θ
)
−
2
cos
α
cos
θ
cos
(
α
+
θ
)
\cos^2 \theta + \cos^2(\alpha + \theta) - 2 \cos \alpha \cos \theta \cos(\alpha + \theta)
cos
2
θ
+
cos
2
(
α
+
θ
)
−
2
cos
α
cos
θ
cos
(
α
+
θ
)
is independent of
θ
\theta
θ
.
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