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Mathematics
Mathematics
Problem
Find the exact value of
cos
15
∘
\cos15^{\circ}
cos
1
5
∘
. a)
6
+
2
8
\dfrac{\sqrt6+\sqrt2}{8}
8
6
+
2
b)
6
−
2
4
\dfrac{\sqrt6-\sqrt2}{4}
4
6
−
2
c)
6
+
2
4
\dfrac{\sqrt6+\sqrt2}{4}
4
6
+
2
d)
6
4
\dfrac{\sqrt6}{4}
4
6
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