TRIGONOMETRY
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Lets try this interesting problem. The interesting part is that first impression of this problem suggests that the answer would be some irrational number, but the beauty of this is answer is 4
We use the following equations:
sin(2x) = 2sin(x)cos(x)
sin(x-y) = sin(x)cos(y) - cos(x)sin(y)
sin(60) = sqrt(3)/2
cos(60) = 1/2
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