Answer:
Given, \[\angle APB=60{}^\circ \] \[\Rightarrow \] \[\angle APO=30{}^\circ \] In right angle\[\Delta \text{ O}AP\], \[\frac{OP}{OA}=\cos ec\,\,30{}^\circ \] \[\frac{OP}{a}=2\Rightarrow OP=2a\]
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