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• ㄱ.$\displaystyle \lim _ {(x, y) \rightarrow (0, 0)} {} \frac{x y ^ {2} \cos y} {x ^ {2} +y ^ {4}}$
• ㄴ.$\displaystyle \lim _ {(x, y) \rightarrow (0, 0)} {} x ^ {2} y \sin \left (\frac{1} {x ^ {2} +y ^ {2}} \right)$
• ㄷ.$\displaystyle \lim _ {(x, y) \rightarrow (0, 0)} {} \frac{x \sin ^ {-1} y} {\sqrt {x ^ {2} +y ^ {2}}}$