Master limit 1

Calculus Level 2

lim(x,y)(0,0)xsin(y)ysin(x)x2+y2= ? \large \displaystyle\lim \limits_{(x,y) \to (0,0) }\frac{x \sin (y) - y \sin ( x)}{x^{2}+ y^{2}} = \ ?

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