Task 1: Group Discussion 1 (20 mins) In Fig. 1, you can see a sine function y1(t)=sin(t) and a cosine function y2(t)=cos(t). Please discuss what is the magnitude of the two functions. Let's say, there is another cosine function is defined as y3(t)=cos(2t+2). Please discuss what its magnitude is? If a signal looks like y4(t)=2cos(2t+21)cos(2t), what's its magnitude? Explain it. (You can search online.)