The condition for which the straight-line \( y=m x+c \) P touches t...

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The condition for which the straight-line \( y=m x+c \)
P touches the parabola \( y^{2}=4 a x \) is:

W
(1) \( a=c \)
(2) \( a / c=m \)
(3) \( m=a^{2} c \)
(4) \( m=a c^{2} \)
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