F,dd   1Courier New1Symbol New1Courier New1Courier NewTimes New RomanTimes New Roman1Courier New1Courier New1Courier New1Courier NewYPYPYPYP{ d< p /?KY 6K@`)@I/a@x% ???h^@q@&@h;OP0h;Oh;O@f@h;O@033333??@^ߛOw?HzG???` }:@[[@@?@ @@@?@@/2??h!@$$$Xy@@yk= GXn= p= @vG@p= @??? $( , XM-쬗T(tXusin(t) u^2cos(2t)ucos(t))x = usin(t); y = u^2cos(2t); z = ucos(t)rPrP/2??h!@$$$@@أp= (\أp= أp= @(\أp= @???$֚(ך,ؚ0ٚ4ښ8ۚ<ܚTȠ~3'$Қےubtx = u; y = b; z = t/2??h!@$$$@@ףp= أp= أp= ףp= أp= @أp= @???ۤܤݤޤߤ$l4|ӚӚҚcutx = c; y = u; z = t/2??h!@$$$@@أp= أp= @ ףp=أp= @أp= @@ ףp=???TabcdefP`ߟԚDԚӚtudx = t; y = u; z = dxyz`(\(\ףp= @ ףp=JXT@@@@@@@@@@@@@@@@@@@@@@@@@@@@   x = usin(t); y = u^2cos(2t); z = ucos(t)h2q@ n@dx = u; y = b; z = th2q ޾5@H&~ K80O@x = c; y = u; z = th2qT5@0(~c.@Բx = t; y = u; z = dh2qQV@cX||]ϋ@