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x=0:pi/100:2*pi;
y1=2*exp(-0.5*x);
y2=cos(4*pi*x);
plot(x,y1,x,y2)
title('x from 0 to 2{\pi}');
xlabel('Variable X');
ylabel('Variable Y');
text(0.8,1.5,'ÇúÏßy1=2e^{-0.5x}');
text(2.5,1.1,'ÇúÏßy2=cos(4{\pi}x)');
legend('y1','y2')
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