Equation of the normal to the parabola, \( \mathrm{y}^{2}=4 \mathrm{ax} \) at its point \( \left...

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Equation of the normal to the parabola, \( \mathrm{y}^{2}=4 \mathrm{ax} \) at its point \( \left(\mathrm{am}^{2}, 2 \mathrm{am}\right) \) is:
(A) \( y=-m x+2 a m+a m^{3} \)
(B) \( y=m x-2 a m-a m^{3} \)
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(C) \( y=m x+2 a m+a m^{3} \)
(D) none
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