Tangent Line from Secant Lines
- Author:
- Jennifer Bayley, Suzanne Doering
We can derive the gradient of a tangent line by taking the limit of the gradients of secant lines.
x_0 changes the point at which you wish to find the gradient
h changes where the second point of your secant line lies.
As h becomes smaller, the secant line becomes a better approximation of the tangent line.