3 ) : use the first Derivative Test to find all relative extrema for f (x ) = CoSR - KIXE 4 1 4 4 : For All = x - Sx , X E ( 1, 4], use The Mean Value Theorem to find the Values of e such that the slope of the tangent line at c is parallel to the scope of the Secant line Connecting )= 1 and X = 4