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Math Help - Can any one solve this diff eqn?

  1. #1
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    Can any one solve this diff eqn?

    dy/dx=sin(x+y)+cos(x+y)
    I’v tried substituting (x+y)=z, but I don’t think its gonna work. Can anyone help?
    Also,
    tan^-1(dy/dx)=x+y
    I'v tried dy/dx=tan(x+y), substituting x+y=z.
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  2. #2
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    Quote Originally Posted by sverbinayak View Post
    dy/dx=sin(x+y)+cos(x+y)
    Iív tried substituting (x+y)=z, but I donít think its gonna work. Can anyone help?
    Also,
    tan^-1(dy/dx)=x+y
    I'v tried dy/dx=tan(x+y), substituting x+y=z.
    Why do you think substituting z = x + y won't work? Did you actually try doing it? Please show what you get and where you're stuck.
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