Can anyone remind me about this. In a plane, there a given curve y=f(x). Now, from a given point on the plane, i can draw a line which is perpendicular to the curve (can be zero, one,two, three ..lines). I can't remember what the equation describing this line(s) is.(adsbygoogle = window.adsbygoogle || []).push({});

Thanks.

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# Perpendicular to a curve

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