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Using implicit differentiation: Is this correct?

  1. Oct 16, 2012 #1
    1. The problem statement, all variables and given/known data

    I need to use implicit differentiation to find the derivative of y=sin(x+y).

    2. Relevant equations

    3. The attempt at a solution

    This is what I did:

    y'=(1+y')(cos(x+y)) (by the chain rule)

    Now, what do I do? Is this correct:

    y'= cos(x+y) / 1-cos(x+y)

  2. jcsd
  3. Oct 16, 2012 #2


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    It's correct with the added parentheses.
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