Please show full code and output. Thanks!

1.4 Develop a MATLAB script to plot the function y(x)=4cosx+94cos3x. where is a variable input at the command prompt. Label the x-axis with time (sec) and the y-axis with y(x)=(4/)cos(x)+(4/9)cos(3x). Include a descriptive header in the script, and verify that the help function will display the header. Choose =1,3,10rad/s and test the script