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Try this:

f1=x
f2=cos(x)
f3=x^2
a = plot(f1, (x,-1,2))
b = plot(f2, (x,-1,2))
c = plot(f3, (x,-1,2))
pic = a+b+c
pic.save('pic.pdf')

Press on the link pic.pdf to see it and download it.

Try this:

f1=x
f2=cos(x)
f3=x^2
a = plot(f1, (x,-1,2))
b = plot(f2, (x,-1,2))
c = plot(f3, (x,-1,2))
pic = a+b+c
pic.save('pic.pdf')

Press on the link pic.pdf to see it and download it.it. Note, with multiple plots you might want to color them. This can be done, for example, with b = plot(f2, (x,-1,2),color='red')

Basically you want to save the picture, not show it. combining show and save is the problem. Try this:

f1=x
f2=cos(x)
f3=x^2
a = plot(f1, (x,-1,2))
b = plot(f2, (x,-1,2))
c = plot(f3, (x,-1,2))
pic = a+b+c
pic.save('pic.pdf')

Press on the link pic.pdf to see it and download it. Note, with multiple plots you might want to color them. This can be done, for example, with b = plot(f2, (x,-1,2),color='red')

Basically you want to save the picture, not show it. combining show and save is the problem. Try this:

f1=x
f2=cos(x)
f3=x^2
a = plot(f1, (x,-1,2))
b = plot(f2, (x,-1,2))
c = plot(f3, (x,-1,2))
pic = a+b+c
pic.save('pic.pdf')

Press on the link pic.pdf to see it and download it. Note, with multiple plots you might want to color them. This can be done, for example, with b = plot(f2, (x,-1,2),color='red')(x,-1,2),color='red'). If you want to show as well insert the line pic.show() right after pic is defined.

Basically you want to save the picture, not show it. combining show and save is the problem. Try this:

f1=x
f2=cos(x)
f3=x^2
a = plot(f1, (x,-1,2))
b = plot(f2, (x,-1,2))
c = plot(f3, (x,-1,2))
pic = a+b+c
pic.save('pic.pdf')

Press on the link pic.pdf to see it and download it. Note, with multiple plots you might want to color them. This can be done, for example, with b = plot(f2, (x,-1,2),color='red'). If you want to show as well insert the line pic.show() right after pic is defined.

f1=x; f2=cos(x); f3=x^2
pic = plot([f1,f2,f3], (x,-1,2), color=["red","green", "blue"]) 
pic.save('pic.pdf')