Find all critical points of the function $\displaystyle f(x,y):= x^4 - 5x^2 + 12x sin y - 12 sin y, x \in \Re, y \in (0,2\pi)$
Last edited by mr fantastic; Mar 11th 2011 at 12:42 PM. Reason: Title.
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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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