属于0*∞型,变形后用罗比塔法则:
lim(x-->π/2)(sinx-1)tanx
=lim(x-->π/2)(sinx-1)/cotx
=lim(x-->π/2)cosx/[-csc^2(x)]
=lim(x-->π/2)[-sin^(x)cosx]
=0
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