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)$

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- Mar 11th 2011, 05:00 AMmaximus101Critical points of function #2
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)$ - Mar 11th 2011, 05:13 AMHallsofIvy
Well, what difficulty are you having? Do you know the

**definition**of "critical point"? Can you find the partial derivatives of this function?