# Critical points of function #2

• Mar 11th 2011, 05:00 AM
maximus101
Critical points of function #2
Find all critical points of the function
$f(x,y):= x^4 - 5x^2 + 12x sin y - 12 sin y,
x \in \Re, y \in (0,2\pi)$
• Mar 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?