From an external point \( P \), tangents are drawn to the parabola;...

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From an external point \( P \), tangents are drawn to the parabola; find the equation of the locus of \( P \) when
\( \mathrm{P} \) these tangents make angles \( \theta_{1} \) and \( \theta_{2} \) with the axis, such that \( \cos \theta_{1} \)

W \( \cos \theta_{2}=\mu \), which is constant.
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