Question 6

Prove the inverse function of f is concave down for all a: E K. As part or your solution, state the theorems (if any) used in your proof. 6. Explain briey and colloquially (no math required) what is logarithmic differentiation. Let y be a function of :1}, and assume a: and y are positive. Find 3/ if my = y\". 7. Let \"xi = ln(:2: ll. Find the rst. second. third. fourth and with derivative of f. AS well. use