limx→0sin2x/sin3x
=limx→0(sin2x/2x)*(3x/sin3x)*(2/3)
limx→0sinx/x=1 就有
limx→0sin2x/sin3x=2/3
因为x~0时,sinx~x,即sin2x~2,同样,sin3x~3.
所以答案为2/3
limx→0sin2x/2x=1
limx→0sin3x/3x=1
limx→0(2x/3x)*[(3x*sin2x)/(2x*sin3x)]=2/3
(这是高等数学的题目啊!)
limx→0sin2x/sin3x=limx→0sin2x/limx→0sin3x=2x/3x=2/3