(adsbygoogle = window.adsbygoogle || []).push({}); grad of curve is its normal ???

i read in a book grad(f)/|grad(f)| is the normal vector of the curve... but actually it should be the cross product of the binormal rite ?? .. how come the binormal is missing here as this expression will give only the tangent !! .. Help plzzzz

mike

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# Grad of curve is its normal ?

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