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能够分别用红、绿、蓝三种颜色在同一个图形窗口绘制下列函数在区间 [-π, π]的图形,y=sin(x), y=cos(x), y=log(x+2π) 的程序是:
A.clear x=-pi:0.1:pi; y1=sin(x); y2=cos(x); y3=log(x+2*pi); plot(x,y1,'r',x,y2,'g',x,y3,'b')
B.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
C.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') hold on y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
D.clear x=-pi:0.1:pi; y=sin(x); y=cos(x); y=log(x+2*pi); plot(x,y,'r',x,y,'g',x,y,'b')
E.clear x=-2*pi:0.1:2*pi; y1=sin(x); plot(x,y1,'r') hold on y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
F.clear x=-2*pi:0.1:2*pi; y1=sin(x); plot(x,y1,'r') y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')