A transverse wave on a cord is given by D$($x$,$t$)=0\mathrm{.}16$sin$(4\mathrm{.}0$x$17\mathrm{.}0$t$)$D$($x$,$t$)=0\mathrm{.}16$sin$(4\mathrm{.}0$x$17\mathrm{.}0$t$),$ where DD and xx are in meters$$and tt is in seconds. what is the frequency of this wave