Guess the derivative function
Catch the point P and move it back and forth to see how the slope changes
The red dots show the value of the slope. The points makes a track that shows the contours of the derivative function.
Guess the derivative function and write it in f '(x)
If you want to delete the track, press the button 'Clear
You can try other functions by changing f (x)
Example given: f(x)=cos(x)
If you want to change the axes write new values in xMin, yMin, xMax, yMax