Exercise 4. Use implicit differentiation for this function: tan(x + y) = yx2. You have to isolate the derivative in your final answer. Exercise 5. Use logarithmic differentiation for the function y = xcos x Write your final answer as a function of x. Exercise 4. Use implicit differentiation for this function: tan(x + y) = yx2. You have to isolate the derivative in your final answer. Exercise 5. Use logarithmic differentiation for the function y = xcos x Write your final answer as a function of x.