- #1
canon23
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Homework Statement
Find the limit, if it exists, or show that the limit does
not exist:
lim (x,y) -> (0,0) [(y^2*sin(x)^2)/(x^4+y^4)]
(According to the textbook the limit 'does not exist')
The Attempt at a Solution
Since the function is approaching the origin [(0,0)]:
test path along y-axis:
let x = 0
lim (y) -> (0) [0/y^4] = 0
test path along x-axis:
let y = 0
lim (x) -> (0) [0/x^4] = 0
This is not efficient enough to prove that the limit is 0, therefore investigate further possibly using the squeeze theorem.
I know that [(y^2)/(x^4+y^4)] <= 1 (but i don't know what to do with this information)
0 <= [(y^2*sin(x)^2)/(x^4+y^4)] <= **
** Here is where i got stuck. I do not know what function fits the criteria and how to look for it. Please excuse me I just learned this theorem recently and I'm hoping someone can help me.