P$4\mathrm{.}7-3$ Let s$($t$)$ be an angle$-$modulated signal that arrives at a receiver, s$($t$)=2$cos$[107$t$+2$sin$(1000$t$+0\mathrm{.}3$$)3$cos$(2000$t$)]$ a$)$ Find the bandwidth of this FM signal. b$)$ If s$($t$)$ is sent to an $($ideal$)$ envelope detector, find the detector output signal. c$)$ If s$($t$)$ is first differentiated before the envelope detector, find the detector output signal. d$)$ Explain which detector output can be processed to y