%Defining given varibles
t = 0 :.1 :3;f1 = 130;f2 = 120;y1 = cosd(2*pi*f1*t);y2 = cosd(2*pi*f2*t);%% Section 2: Processing
%equation given
y = 2 * cos(2*pi(f1+f2/2)*t) * cos(2*pi(f1-f2/2)*t);%% Section 3: Result Output
plot(y)title('Alternating Loud and Quiet Sounds')xlabel('Time(s)')ylabel('Amplitutde')
MATLAB: Error using ‘pi’ too many input errors with the equation
pi
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