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Problem
Problem
The perimeter of a triangle is 6 times the arithmetic mean of the sines of its angles. If the side
a
a
a
is 1, then
A
A
A
is equal to a.
30
∘
30^\circ
3
0
∘
b.
60
∘
60^\circ
6
0
∘
c.
90
∘
90^\circ
9
0
∘
d.
120
∘
120^\circ
12
0
∘
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