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Mathematics
Mathematics
Problem
If
cos
α
=
1
2
(
x
+
1
x
)
\cos \alpha = \frac{1}{2} \left( x + \frac{1}{x} \right)
cos
α
=
2
1
(
x
+
x
1
)
,
cos
β
=
1
2
(
y
+
1
y
)
\cos \beta = \frac{1}{2} \left( y + \frac{1}{y} \right)
cos
β
=
2
1
(
y
+
y
1
)
,then evaluate
cos
(
α
−
β
)
\cos(\alpha - \beta)
cos
(
α
−
β
)
.
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