题目
8.设lim_(x to 0) (sin 2x + xf(x))/(x^3) = 1,则lim_(x to 0) (2cos x + f(x))/(x^2) = ____.A. 0B. -(2)/(3)C. (4)/(3)D. infty
8.设$\lim_{x \to 0} \frac{\sin 2x + xf(x)}{x^3} = 1$,则$\lim_{x \to 0} \frac{2\cos x + f(x)}{x^2} = $____.
A. 0
B. $-\frac{2}{3}$
C. $\frac{4}{3}$
D. $\infty$
题目解答
答案
A. 0