To create a surface of revolution of a function in the xy-plane around the y-axis, follow these steps:
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[*] Graph your function, f(t). (in this example, f(t) = -(x-1)(x-5) )
[*] The surface is generated using the SURFACE[ t cos(u) , f(t) , t sin(u) , t , 1 , 5 , u , 0 , 2pi ]
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