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Chas3down
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Homework Statement
Find the 4 critical points f(x,y) = 5ycos(9x) closest to (0,0)
Homework Equations
The Attempt at a Solution
fx = -45ysin(9x)
fy = 5cos(9x)
fxx = -45*9ycos(9x)
fyy = 0
fxy = -45sin(9x)
y=0
x=pi/18
(0,pi/18) (0,pi/18 + pi/2) (0,pi/18 - pi/2) (0,pi/18 + 3pi/2) Was not correct.
(All 4 points need to be correct for me to check it )
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