Solution to Exercise 6.1

x=-pi:pi/100:pi;
y=cos(x);
plot(x,y),title('Graph of y=cos(x)'),xlabel('x'),ylabel('y'),grid

    » x=0:pi/10:pi/2;
» y=cos(x);
» area1=trapz(x,y)
 
area1 =
 
    0.9918

    » x=-pi:pi/1000:pi/2;
» y=cos(x);
» area2=trapz(x,y)

area2 =

    1.0000