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t^2*x¨•-4tx¨@+6x=36©Rt/t    ,    x1=t^2  ,x2=t^3
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t^2x¨•-3tx¨@+8x=18t^2sin(©Rt).   x1=t^2cos(2©Rt)   ,x2=t^2sin(©Rt)

[ Last edited by javeey on 2010-5-4 at 19:25 ]
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