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Problem in solving differential eqn by DSolve


Dear Expert,
           I have four differential eqn set. Only one set of differential eqn i will able solve. I am not able attached my pdf file here. plz send mail id so i can attach pdf file and send directly to them.  
 eqns = {AA'[x] + f*CC[x] == 0, BB'[x] - CC[x] - f*DD[x] == 0, 
  CC'[x] + BB[x] + f*AA[x] == 0, DD'[x] - f*BB[x] == 0}
ic = {AA[0] == 1, BB[0] == 0, CC[0] == 0, DD[0] == 0}
DSolve[{eqns, ic}, {AA, BB, CC, DD}, x]

  I have solve this eqn. Other three similar eqn i am not able to solve.
   I am waiting for your reply.

With best regards,
 Swarup





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