可以
=lim (x/sinx)·(sinx/x)' /2x
=(1/2) lim (1/sinx)·((x·cosx-sinx)/x²)
=(1/2) lim ((x·cosx-sinx)/x³)
=(1/2) lim ((-x·sinx)/(3x²))
=-1/6
不直接用洛比达法则:
lim ln(sinx/x) / x^2
=lim (sinx/x -1) / x^2
=lim (sinx -x) / x³
=lim (cosx -1) /(3x²)
= -1/6
可以
=lim (x/sinx)·(sinx/x)' /2x
=(1/2) lim (1/sinx)·((x·cosx-sinx)/x²)
=(1/2) lim ((x·cosx-sinx)/x³)
=(1/2) lim ((-x·sinx)/(3x²))
=-1/6
不直接用洛比达法则:
lim ln(sinx/x) / x^2
=lim (sinx/x -1) / x^2
=lim (sinx -x) / x³
=lim (cosx -1) /(3x²)
= -1/6