►Problem 1.3 Figure 1.15 shows a triangular wave. What is the fundamental fre- quency of this wave? Express the fundamental frequency in units of Hz and rad/s. x(1) www 0 0.1 0.2 0.3 0.4 0.5 Timet, seconds 0.6 0.7 0.8 0.9 1 FIGURE 1.15 Triangular wave alternating between -1 and +1 for Problem 1.3. ►Problem 1.4 Determine the fundamental frequency of the discrete-time square wave shown in Fig. 1.16. x[] TE FIGURE 1.16 Discrete-time square wave alternating between -1 and +1.