If the tangent t the curv y=f(x )"at" P(...

If the tangent t the curv `y=f(x )"at" P(x_(1),y_(1))` is paralle to the y-axis, then the of the normal to the curve at P is -

`y=x_(1)`

`y=y_(1)`

`x=x_(1)`

`x=y_(1)`

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