If \( M \) is the foot of the perpendicular from a point \( P \) on
a parabola \( y^{2}=4 a x \).... VIDEO
If \( M \) is the foot of the perpendicular from a point \( P \) on
\( \mathrm{P} \)
a parabola \( y^{2}=4 a x \) to its directrix and triangle \( S P M \) is equilateral, where \( S \) is the focus then the value of \( S P \) is
(1) \( a \)
(2) \( 2 a \)
(3) \( 4 a \)
(4) \( 8 a \)
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