Critical points of function #2

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March 11th 2011, 05:00 AM
maximus101

Critical points of function #2

Find all critical points of the function
$f(x,y):= x^4 - 5x^2 + 12x sin y - 12 sin y, <br /> x \in \Re, y \in (0,2\pi)$
March 11th 2011, 05:13 AM
HallsofIvy

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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