JST17 10. Section 1a Gradient of a chord on a quadratic curve

Move the point Q closer to the point P. How does the gradient of the chord PQ change?[br]Make Q as close to P as you can. What value do you think the gradient of the chord approaches, as Q gets close to P?[br]Use the slider to change the position of P and repeat.
– Jill Stephenson, Integral Resources

Information: JST17 10. Section 1a Gradient of a chord on a quadratic curve