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lim(x->π/3) (1-2cosx)/sin(x-π/3)
=lim(x->π/3) (1-2cosx)/(x-π/3)
=lim(x->π/3) (1-2cosx)/(x-π/3) (0/0 分子分母分别求导)
=lim(x->π/3) 2sinx
=2sin(π/3)
=√3
=lim(x->π/3) (1-2cosx)/(x-π/3)
=lim(x->π/3) (1-2cosx)/(x-π/3) (0/0 分子分母分别求导)
=lim(x->π/3) 2sinx
=2sin(π/3)
=√3
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