$5\mathrm{.}7$ Waveform in Fig. P$5\mathrm{.}7$ with $A=4.$

Figure P$5\mathrm{.}7$: Waveform for Problem $5\mathrm{.}7.$

$5\mathrm{.}15$ Waveform in Fig. P$5\mathrm{.}15$ with $A=20.$

Figure P$5\mathrm{.}15$: Waveform for Problem $5\mathrm{.}15.$