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Math Help - How do you implicitly differentiate a trig funciton

  1. #1
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    How do you implicitly differentiate a trig funciton

    Hi everybody. I'm new here. I am now working on a calculus problem on implicit differentiation, but I am kinda lost. The question asks me to differentiate x cos y = 1. I have no clue how to start. Can anyone please help me? Thanks a lot.
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  2. #2
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    Mar 2010
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    I would just use the product rule:

     \cos y + x(-\sin y)\frac{dy}{dx} = 0

    Or you can use the Implicit Function Theorem.
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