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plot(x,y2);

axis([-2*pi 2*pi -1 1]) set(gca,'xtick',-2*pi:pi:2*pi) set(gca,'ytick',-1:0.5:1)

set(gca,'xticklabel','-2pi|-pi|0|pi|2pi') set(gca,'yticklabel','-1|-0.5|0|0.5|1') xlabel('x');ylabel('y2'); title('cos(x)'); gridon; subplot(2,2,3)

axis([-2*pi 2*pi -1 1]) plot(x,y3);

axis([-2*pi 2*pi -1 1]) set(gca,'xtick',-2*pi:pi:2*pi) set(gca,'ytick',-1:0.5:1)

set(gca,'xticklabel','-2pi|-pi|0|pi|2pi') set(gca,'yticklabel','-1|-0.5|0|0.5|1') xlabel('x');ylabel('y3'); title('sin(2x)'); gridon; subplot(2,2,4)

axis([-2*pi 2*pi -1 1]) plot(x,y4);

axis([-2*pi 2*pi -1 1]) set(gca,'xtick',-2*pi:pi:2*pi) set(gca,'ytick',-1:0.5:1)

set(gca,'xticklabel','-2pi|-pi|0|pi|2pi') set(gca,'yticklabel','-1|-0.5|0|0.5|1') xlabel('x');ylabel('y4'); title('cos(2x)'); gridon;

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closeall clc

x=[-2*pi:pi/100:2*pi]; y1=sin(x); y2=cos(x); y3=sin(2*x); y4=cos(2*x); holdon

plot(x,y1,'r-'); plot(x,y2,'m--'); plot(x,y3,'k-.'); plot(x,y4,'b:');

legend('sin(x)','cos(x)','sin(2x)','cos(2x)') gridon;

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¢Û»æÖÆÈýάÇúÏߣº³ÌÐò£º closeall clc

x=sin(t); y=cos(t); z=t.*x.*y; plot3(x,y,z);

?x?sin(t)?(0?t?20?)?y?cos(t)?z?tsin(t)cos(t)?

t=[0:pi/100:20*pi];

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