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{SECT 0 {EXCHG {PARA 256 "" 0 "" {TEXT 256 15 "Conic Sections\n" }
{TEXT -1 25 "for Math 252, Spring 2005" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 21 "restart;\nwith(plots):" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 19 "z := sqrt(x^2+y^2);" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 65 "Cone := plot3d([z,-z],x=-3..3,y=-3..3,numpoints=4000,
color=blue):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 91 "P := animat
e3d(1-x*t,x=-3..3,y=-3..3,t=0..2,color=red,view=[-3..3,-3..3,-3..3], f
rames=50):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "display(Cone,
P);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "
> " 0 "" {MPLTEXT 1 0 0 "" }}}}{MARK "8" 0 }{VIEWOPTS 1 1 0 1 1 1803 
1 1 1 1 }{PAGENUMBERS 0 1 2 33 1 1 }