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Two curves in one coordinate system

Octave

% Octave code to plot the function, 
% y = x.^2 and y = x.^-2
% in the domain of, [-4, 4]
close all
x = -4:.1:4;
y1 = x.^2; 
y2 = -x.^2;

h = plot(x, y1, -b, x, y2, :c)
grid on
xlabel(x), ylabel(y), axis([-4, 4, -20, 20])
text(-.5, 5, f(x) = x^2)
set (h(1), "linewidth", 3) 
set (h(2), "linewidth", 3) 

text(-.5, -5, f(x) = -x^2)

print -deps twoPlots.eps
print -dpng twoPlots.png set (h(1), "linewidth", 10)

Maple

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