lim lncos3x÷lncos4x
=lim (-3sin3x/cos3x)÷（-4sin4x/cos4x)
=lim (3sin3x)/(4sin4x)
=lim (9cos3x)/(16cos4x)
=9/16
lim(x→0)lncos3x÷lncos4x
=lim(x→0)(-3sin3x/cos3x)/(-4sin4x/cos4x)
=lim(x→0)(3sin3x)/(4sin4x)
=lim(x→0)(9cos3x)/(16cos4x)
=9/16
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