var('x')
f(x)=2*abs(x)
plot(f(x),(x,-3,3))+plot(abs(x), (x, -3, 3), color='red')
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var('x')
f(x)=2*x/3
plot(f(x),(x,-3,3))+plot(x/3,(x,-3,3),color='red')
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var('x')
f(x)=5*x^2
plot(f(x),(x,-3,3))+plot(x^2,(x,-3,3),color='red')
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var('x')
f(x)=4*x^3/3
plot(f(x),(x,-3,3))+plot(x^3/3,(x,-3,3),color='red')
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