By writing [math] and using the Chain Rule, one can verify that [math].
(a) If [math], find [math].
(b) Where is [math] not differentiable? Merely give the smallest positive value of [math].
(c) If [math], find [math].
(d) Where is [math] not differentiable?
(a) [math]
(b) At [math]
(c) [math]
(d) At [math]