Nilai limx→0 sin4x−sin4xcos2x4x3=....\lim\limits_{x\rightarrow0}\ \frac{\sin4x-\sin4x\cos2x}{4x^3}=....x→0lim 4x3sin4x−sin4xcos2x=....
14\frac{1}{4}41
12\frac{1}{2}21
222
333
444