F,dd   1Courier New1Symbol New1Courier New1Courier NewTimes New RomanTimes New Roman1Courier New1Courier New1Courier New1Courier NewYPYPYPYP{ d< p x?Of@OfOf@s˚0*R=_@x% ???q^H-gM@h;Oh;OP0h;O@h;O@f@033333??@^ߛOw?HzG???` }:@[[@@?@ @@@?@@/2??h!@$$$Xy@@Xn= yk= Gp= @p= @vG@??? $( , XM-쬗h)pucos(t)usin(t) u^2cos(2t))x = ucos(t); y = usin(t); z = u^2cos(2t)rPrP/2??h!@$$$@@أp= (\أp= أp= @(\أp= @???$֚(ך,ؚ0ٚ4ښ8ۚ<ܚTȠ~3'$Қےubtx = u; y = b; z = t/2??h!@$$$@@Q?أp= أp= Q?أp= @أp= @???ۤܤݤޤߤ$l4|ӚӚҚcutx = c; y = u; z = t/2??h!@$$$@@أp= أp= @ ףp=أp= @أp= @@ ףp=???TabcdefP`ߟԚDԚӚtudx = t; y = u; z = dxyz`(\(\Q?@ ףp=JXT@@@@@@@@@@@@@@@@@@@@@@@@@@@@   x = ucos(t); y = usin(t); z = u^2cos(2t)/t@@;/ l@dx = u; y = b; z = t/t ޾5@H&~`d‹@x = c; y = u; z = t/tT5@0(~]h@Բx = t; y = u; z = d/tQV@cH;g/3@