Tangents \( P Q \) and \( P R \) are drawn to the parabola
P \( y^{... VIDEO
Tangents \( P Q \) and \( P R \) are drawn to the parabola
P \( y^{2}=20(x+15) \) and \( y^{2}=60(x+15) \), respectively
W such that \( \angle R P Q=\frac{\pi}{2} \). Then the locus of point \( P \) is:
(1) \( x+10=0 \)
(2) \( x+30=0 \)
(3) \( x+40=0 \)
(4) \( x+20=0 \)
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