# The derivative function and the tangent to the curve

- Author:
- Chela Weitzel, Tim Brzezinski

- Topic:
- Derivative

In the applet below, a function

*f*is shown (black). You can enter in any function you like. Its derivative function, f', is shown in gray. As you move the slider, you will see a visual explanation of the relationship between the derivative and the gradient of the tangent for a value of x. You can also move the tangent along the curve by moving the large white dot.## New Resources

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