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Mathematics
Mathematics
Problem
Calculate the exact value of
cos
765
∘
\cos 765^{\circ}
cos
76
5
∘
. a)
1
2
\dfrac{1}{2}
2
1
b)
2
2
\dfrac{\sqrt{2}}{2}
2
2
c)
−
2
2
-\dfrac{\sqrt{2}}{2}
−
2
2
d)
3
2
\dfrac{\sqrt{3}}{2}
2
3
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