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Math Help - Please Solve appropriate substitution

  1. #1
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    Please Solve appropriate substitution

    Solve the D.E by using an appropriate substitution
    cos(x+y)dy=dx
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    Substitute u=x+y.
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  3. #3
    Junior Member
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    and the answer should be something like:

    y \left( x \right) =-x+1/2\,\pi
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