Find the limit of the function f(x,y) = sin(2(x² + y²)) /2(x² + y²) as (2, y) + (0,0). Assume that polynomials, exponentials, logarithmic, and trigonometric functions are continuous. [Hint: limt→o sint/t = 1.) lim(x,y)→(0,0) sin2(x²- y²)/2(x² + y²) = (Enter DNE if the limit does not exist.)