程序如下:x=linspace(0,4*pi,100);y1=sin(x);y2=cos(x);y3=sin(x)./(cos(x)+eps);y4=cos(x)./(sin(x)+eps);subplot(2,2,1); plot(x,y1),title('sin(x)');subplot(2,2,2); plot(x,y2),title('cos(x)');subplot(2,2,3); plot(x,y3),title('sin
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