Answer Happy

Please assist with these questions on Clairauts theorem and
Chain rule and implicit differentiation
Clairaut's Theorem Give one example of a function where the Clairaut Theorem fails, and justify your answer [5] Chain rule and implicit differentiation Suppose that f, g are differentiable and r = f(u, v), y = g(u, v) where u and v define 2 and y implicitly. Show that a(u, v) 1 a(,y) a(.) au, [5]