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Extracted text: The parametric representation of the surface y2 - 4y + z2 = 0,0 <>< 3="" %3d="" is="" a)="" f(u,="" v)="(v," 2="" +="" 2="" cos="" u,="" 2="" +="" 2="" sin="" u),="" 0="">< u="">< 2n,0="" s="" vs="" 3.="" b)="" (u,="" v)="(2" cos="" u="" ,2="" sin="" u="" ,v),="" 0="" s="" us="" 2n,="" 0="">
< v="">< 3. d) f(u, v) = (v, 2 + 2 cos u , 2 sin u), 0 3.="" d)="" f(u,="" v)="(v," 2="" +="" 2="" cos="" u="" ,="" 2="" sin="" u),=""> 3. d) f(u, v) = (v, 2 + 2 cos u , 2 sin u), 0>