Compl 21. A one-sided limit can be used to determine the behaviour of a graph on either side of a 22. A graph is if the left-hand limit does not equal the right-hand limit as x -> a. 23. The derivative of a function represents the of the tangent at any point on the function. 24. The limit of a function at x = a may exist even though the function is at x = a. 25. If the derivative does not exist at a point on the curve, the function is at that x-value