问题标题：
lim(x趋向0)x^2/(sin^2)*x/3
问题描述：
lim(x趋向0)x^2/(sin^2)*x/3
倪培宏回答：
x→0limx^2/sin^2(x/3)=lim9*x^2/9/sin^2(x/3)=9*lim(x/3)^2/sin^2(x/3)=9*lim[(x/3)/sin(x/3)]^2=9*[lim(x/3)/sin(x/3)]^2根据重要的极限：limsinx/x=1=9*1^2=9有不懂欢迎追问
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