题目lim_((x,y) to (0,0)) (sin(x^3 + y^3))/(x + y) = ( )A. 1B. 0C. 不存在D. 0或1$\lim_{(x,y) \to (0,0)} \frac{\sin(x^3 + y^3)}{x + y} =$ ( )A. 1B. 0C. 不存在D. 0或1题目解答答案B. 0