Study the stability of the limit cycle

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1. Study the stability of the limit cycle r=1  for the system given in polar coordinates by the equations  r ? =(r^2 -1)(2x-1)  , φ ? =1  . (where x=rcosφ  ). 

2. Solve the equation dy/dx =y+h N   , where h N (x)=N  for |x-1|<1/2N   and 0  for |x-1|≥1/2N   with initial condition y(0)=0  , and find the limit of the solution as N→∞  .

3. Prove that δ(αx)=δ(x)/|α|   . ( In particular, if α=-1  , we can see δ(x)  is an even "function".

Reference no: EM13956835

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