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X'=cos(x+t) solve for x

  1. Sep 13, 2007 #1
    1. The problem statement, all variables and given/known data

    solve the differential eqn: dx/dt=cos(x+t)

    2. Relevant equations

    3. The attempt at a solution


    let z=sinx, dz/dx=cosx


    however this substitution quickly fails

    any ideas?

  2. jcsd
  3. Sep 13, 2007 #2

    D H

    Staff: Mentor

    Try something simpler. Hint: You don't need to expand cos(x+t).
  4. Sep 13, 2007 #3
    Used z=x+t

    get: int(1/(cosz+1)=in(t) on seperation of the variables.

  5. Sep 13, 2007 #4

    D H

    Staff: Mentor

    Can you finish the problem now?
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