1. Differentiate: = ln (32/^2x ) 2. Find the value/s of where the tangent line is horizontal to the graph of () = 3ln (). Please note, the domain of () is (0, ). 3. Find the equation of the tangent line to the graph of () = 4 3 at = 0 4. A drug is injected into a patient's blood stream through her right arm. The drug concentration (in milligrams per cubic centimeter) in the bloodstream of the left arm hours after the injection is given by () = 0.14/^2 + 1 a. Find () b. Find (0.5) and (3), and interpret the results