在平面直角坐标系\(xOy\)中,已知单位圆\(O\)与\(x\)轴正半轴交于点\(A\),\(P(\cos 2,-\sin 2) \)为圆上一点,则劣弧\( \overset{⌢}{AP} \)的弧长为_______.
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