Normal derivative of derivated variable not working in Maple











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I have done this and I really have no idea what is wrong with Maple. Here is the equation and the Maple respond:





The text of error is: Error, invalid input: diff received diff(theta1(t), t), which is not valid for its 2nd argument.



I have no idea how to solve the equation…



Thanks in advance!






differential-equations derivatives maple







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    up vote
    0
    down vote

    favorite












    I have done this and I really have no idea what is wrong with Maple. Here is the equation and the Maple respond:





    The text of error is: Error, invalid input: diff received diff(theta1(t), t), which is not valid for its 2nd argument.



    I have no idea how to solve the equation…



    Thanks in advance!






    differential-equations derivatives maple







    share|cite|improve this question


























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have done this and I really have no idea what is wrong with Maple. Here is the equation and the Maple respond:





      The text of error is: Error, invalid input: diff received diff(theta1(t), t), which is not valid for its 2nd argument.



      I have no idea how to solve the equation…



      Thanks in advance!






      differential-equations derivatives maple







      share|cite|improve this question















      I have done this and I really have no idea what is wrong with Maple. Here is the equation and the Maple respond:





      The text of error is: Error, invalid input: diff received diff(theta1(t), t), which is not valid for its 2nd argument.



      I have no idea how to solve the equation…



      Thanks in advance!






      differential-equations derivatives maple




      differential-equations derivatives maple






      share|cite|improve this question















      share|cite|improve this question













      share|cite|improve this question




      share|cite|improve this question








      edited 15 hours ago









      user302797

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      19.3k92251










      asked 16 hours ago









      Ali

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      32



























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