lim x→0时.f(x)/x=2,
所以
lim x→0时.f(3x)/3x=2,
f(3x)等价于6x
所以
lim x→0时,sin4x/f(3x)
=lim x→0时,sin4x/6x
=4/6
=2/3
选C.
lim x→0时.f(x)/x=2,则lim x→0时,sin4x/f(3x)=多少..A.1 B.1/2 C.2/3
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