Curve tangent to a surface Show that the curve

4.2 What Derivatives T ells Us I. What first derivatives tells us Increasing/Decreasing Test (I/D Test) If f ‘ > 0 on interval f is increasing on the interval If f ‘ < 0 on interval f is decreasing on the interval F is decreasing on (-5,-2) (0,5) F ‘ < 0 F is increasing on (-2,0) F ‘ > 0 Corner points f ‘ DNE o F ‘ (-2) DNE,...