Click
and drag the mouse to change the viewing direction. When
radio button to rotate axes is selected, cursor keys change
the x, y coordinates and with control key pressed down up and
down keys change the z coordinate.
Applet shows the relation
between integration and differentiation for a definite
integral.
Imagine the graph represents
the position of a body moving along the x- axis with varying
velocity. If you wanted the displacement between 1 s and 3 s,
you could note the values of x coordinate (represented on the
y axis) at these times and the difference would be the sought
displacement. But let us get it by a different method.