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Geometry Level 2

If 0xi900\le x_{i} \le 90 where ii is positive integer and sin(x1)+sin(x2)+sin(x3)=3\sin(x_{1})+\sin(x_{2}) + \sin(x_{3})=3

Find cos(x1)+cos(x2)+cos(x3)\cos(x_{1})+\cos(x_{2})+\cos(x_{3})

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