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Mathematics
Mathematics
Problem
If
tan
γ
=
sec
α
sec
β
+
tan
α
tan
β
\tan \gamma = \sec \alpha \sec \beta + \tan \alpha \tan \beta
tan
γ
=
sec
α
sec
β
+
tan
α
tan
β
, then the highest value of
cos
2
γ
\cos 2\gamma
cos
2
γ
is: (a)
−
1
-1
−
1
(b)
1
2
\frac{1}{2}
2
1
(c)
−
1
2
-\frac{1}{2}
−
2
1
(d)
0
0
0
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