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An interactive three dimensional plot with three perpendicular axes shown. A helical path is shown in black that moves up as the curve rotates around the vertical axis. A blue arrow is shown from the origin to a point on the curve and is labeled
\(\vr(t)\text{.}\) A green arrow is shown from the origin to a point further along the black curve and is labeled
\(\vr(t+h)\text{.}\) The slider at the top of the plot changes the distance along the curve between the blue and the green arrows. A red arrow is drawn from the end of the blue arrow to the end of the green arrow. The red arrow is labeled
\(\vr(t+h) -\vr(t)\text{.}\)