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yy1 = sin(2*pi*0.01*[0:1:999]);
yy2 = cos(2*pi*0.01*[0:1:999]);
figure(10);
plot(yy1);
grid on;
figure(20);
plot(yy2, 'r');
grid on;
figure(30);
plot(yy1);
hold on;
grid on;
plot(yy2, 'r');
plot(yy1+yy2, 'g');