Hello!

Trying to find these limits (or show they do not exist)

Using the two path method (to show non-existance)

Not sure how to show they exist (unless they go a certain number by an identity?)

Any help appriciated! Thanks!

$\displaystyle \lim_{(x,y)-->(0,0)} \frac{\sin{x^3y^3}}{x^6+y^6} $

$\displaystyle \lim_{(x,y)-->(2,-3)} \frac{x\sqrt{y}}{\sqrt{x^3-y^3}} $

$\displaystyle \lim_{(x,y)-->(1,2)} \frac{y-x}{\sqrt{x}(y-2)} $