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Mathematics
Problem
Find the value of
5
(
cos
34
∘
cos
56
∘
−
sin
34
∘
sin
56
∘
)
5\bigl(\cos34^{\circ}\cos56^{\circ}-\sin34^{\circ}\sin56^{\circ}\bigr)
5
(
cos
3
4
∘
cos
5
6
∘
−
sin
3
4
∘
sin
5
6
∘
)
. a)
5
5
5
b)
2.5
2.5
2.5
c)
0
0
0
d)
0.93
0.93
0.93
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