Please reason step by step, and put your final answer within \boxed{}.
Given a moving point $P$, two tangents $PA$ and $PB$ are drawn to the circle $x^{2}+y^{2}=1$, with tangent points $A$ and $B$ respectively, and $\angle{APB}=60^{\circ}$. Determine the trajectory equation of the moving point $P$.
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