A graphing calculator is recommended. Use the Squeeze Theorem to show that lim x2 cos(13nx) = 0. Illustrate by graphing the functions f(x) = -x2, g(x) = x2 cos(13nix), and h(x) = x2 on the same screen. Let f(x) = -x2, g(x) = x2 cos(13ntx), and h(x) = x2. Then ? v s cos(13nx) S ? v = [? vex cos(13nx)