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Mathematics
Mathematics
Problem
Find the exact value of
cos
75
∘
\cos75^{\circ}
cos
7
5
∘
. a)
6
4
\dfrac{\sqrt6}{4}
4
6
b)
1
2
\dfrac{1}{\sqrt2}
2
1
c)
6
−
2
4
\dfrac{\sqrt6-\sqrt2}{4}
4
6
−
2
d)
6
+
2
4
\dfrac{\sqrt6+\sqrt2}{4}
4
6
+
2
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