<p>Hey... can someone please explain to me what the difference is between cones (points of non-differentiability on a graph) and cusps (points where there is a tangent line)? I understand how to get them (you take the derivative of the function, and then find the point that makes the denominator zero... but they both seem to the same to me. So how do you tell which is which?</p>
<p>cusps sort of curve as they approach the point of cusping (that is most def. not a word).</p>
<p>cones reach there points of conage (not a word either) in straight lines.</p>
<p>i'm not sure if that is even true, i was sorta speculating there.</p>
<p>haha yeah. but how do you tell the difference when you are solving the problem (without looking at a graph)</p>
<p>no idea. i took ab last year, and we did not have to differentiate b/w cusps/cones on the exam...</p>
<p>Maybe the second derivative. First derivative is underfined, and then it might be a point of inflection, which is more common of a cusp.</p>