How to customize legend in matlab

#How to customize the legend in matlab? How to add legend using code in Matlab?

As shown in the figure, first open the matlab software.

As shown in the picture, click the red box check button to create a new file.

Enter the following code.

x = 0:pi/50:2*pi;
y = sin(x);
y1=cos(x);
figure  
plot(x,y,'r')
hold on 
plot(x,y1,'b')

#Get the graph as shown in the figure. You can see that this graph has no legend.

As shown in the picture, add a line of code to the above code: legend('a','b');

As shown in the figure, a legend has been added to the figure.

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