Wite a function in $M$ file to generate a cosine wave with the following specifications:

Name the function as cuazen.

$f=$ desired frequency

dur $=$ duration of the wavefiom in secunds

take $20$ samples per period

plot the cosine function

Write the function in M$-$frile and execute the program in MATLAB cummand window. Prove that your program works for $2000$ Hz and $3000$ Hz $.$ Plot the function for $3$ cycles.$\{$:$[$f$\_($x$)>"$ function cosgen $"],[$t$=0$:$1//(20****)$d$],[$y$=$cos$(2**$pdi$**$f$****$t$]$:$\}$