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41 - 40*cos(a) = 52 - 48*cos(b) and 41 - 40*cos(a) = 61 - 60*cos(a + b)
41 - 40*cos(a) = 52 - 48*cos(b) and 41 - 40*cos(a) = 61 - 60*cos(a + b)
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