Given that the restriction of the cosine function cos to i : = [0, 1] is strictly decreasing and that cos 0 = 1, cos 7 = -1, let ) : = (-1,1), and let arccos: j r be the function inverse to the restriction of cos to i. show that arccos is differentiable on (-1, 1) and d acrccos y = (-1)/(1-2)2 for ye (-1, 1). show that arccos is not differentiable at -1 and 1.