(x^2-sinx)/(3x^2+2cosx)的极限,x趋向于无穷

问题描述:

(x^2-sinx)/(3x^2+2cosx)的极限,x趋向于无穷

x趋近0时,对分子,分母求二次导数,得1/2;
x趋近无穷时,取二次项系数1/3