plot(2*x^2 - x + 4)
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f(x)= -2*x
p1 = plot(f(x), (x,-10,10), ymax=10, ymin=-10, color='blue')
p2 = plot(x^2 - 8*x +9, (x,-10,10), color='red')
p1 + p2
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var('x')
p1 = plot(2*x^3+9*x^2-1, (x, -5, 5), ymax=10, ymin=-10, color='red')
p2 = plot(2*x^3-x, (x, -5, 5), ymax=10, ymin=-10, color='blue')
p1 + p2
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var('x')
p1 = plot(2*x^3+9*x^2-1, (x, -5, 5), ymax=10, ymin=-10, color='red')
p2 = plot(2*x^3-x, (x, -5, 5), ymax=10, ymin=-10, color='blue')
p1 + p2
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