Let n be a positive integer. let f(x) = x** sin if x0 and let f(0)= 0. for what value of n will f be twice differentiable but with its second derivative discont

Let n be a positive integer. Let f(x) = x** sin if x0 and let f(0)= 0. For what value of n will f be twice differentiable but with its second derivative discontinuous at x = 0? [2005]