want it as a matlab code

1. Plot the function: 2cos(200t) which is sampled with frequency 1kHz for 3 periods. Give the plot a title, legend, xlabel, ylabel, turn on grid lines 2. Plot the function: 2cos(200t)+sin(100t) which is sampled with frequency 1kHz for 3 periods. Give the plot a title, legend, xlabel, ylabel, turn on grid lines