# Solve these differential equations?

Posted 7 months ago
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 I want to solve these differential equations but could not get the simplified answer. Can anyone help me? it will be very appreciated. See the attached file for your reference. Attachments:
 What is the purpose of this question? Mathematica finds the solution with all seven parameters C2, Bi, k, A1, S, A2, A3 free: assumption free and without values:as usual the simplified answer appears with the help of specialisation. If all parameters must remain formal, then you could try to find subexpressions in the solution.