Let f(x) = sin a and v Nodes = (0.5, 1, 2). (a) Write a matlab function Coeff-SplineN(vNodes,f) that takes the nodes and a function f and outputs the coefficient of a natural cubic spline. (b) Apply (a) to write the natural cubic spline of f at the given nodes. (c) Plot the graph of the natural spline with the graph of f