23/02/05 09:58:19.71 4WCR/OIw.net
前>>442
>>425
x=cost+sint
dx=-sintdt+costdt
y=2cos2t-2sin2t
=2cos^2t-2sin^2t-4sintcost
=2cos^2t+2sin^2t-4sin^2t-4sintcost
=2-4xsint まだt残るなぁ。
sint=(2-y)/4x
dy=-4sin2t-4cos2t
=-8sintcost-4cos^2t+4sin^2t
=-4(cost+sint)^2+8sin^2t
=-4x^2+8sin^2t
=-4x^2+(2-y)^2/2x^2
(中断)