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Math Help - Critical points of function #2

  1. #1
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    Critical points of function #2

    Find all critical points of the function
    f(x,y):= x^4 - 5x^2 + 12x sin y - 12 sin y, <br />
x \in \Re, y \in (0,2\pi)
    Last edited by mr fantastic; March 11th 2011 at 12:42 PM. Reason: Title.
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  2. #2
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    Well, what difficulty are you having? Do you know the definition of "critical point"? Can you find the partial derivatives of this function?
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