Let h[n] denote the response of a system for which the input signal is the unit im- pulse function [n]. Suppose that h[n] for a causal system has the given even part he[n] for n 0: 0, n = 0 1, n = 1. 2, n 2 Find h[n] for all time, with your answer expressed as a mathematical function. he[n]= =