f(x)=abs(x^2-1)
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plot(f(x), (x, -3, 3))
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f(x)=sqrt(abs(x))
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plot(f(x))
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f(x)=x^3
g(x)=2*x^3
h(x)=1/2*x^3
plot(f(x), (x, -3, 3))+plot(g(x), (x, -3, 3), color='red')+plot(h(x), (x, -3, 3),color='black')
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