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plot y = (4/3)x, y = 2x^2 -27 , (x-4.5)^2+(y-13.5)^2 = 20.25, from x=0 to 9
plot y = (4/3)x, y = 2x^2 -27 , (x-4.5)^2+(y-13.5)^2 = 20.25, from x=0 to 9
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