求lim(x->1)[(3x-3)tan((π/2)x]

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求lim(x->1)[(3x-3)tan((π/2)x]求lim(x->1)[(3x-3)tan((π/2)x]求lim(x->1)[(3x-3)tan((π/2)x]lim(x->1)[(3x-3)

求lim(x->1)[(3x-3)tan((π/2)x]
求lim(x->1)[(3x-3)tan((π/2)x]

求lim(x->1)[(3x-3)tan((π/2)x]
lim(x->1)[(3x-3)tan((π/2)x]
=lim(x->1)[(3x-3)/cot((π/2)x]
分子分母求导数
3/[-1/sin²((π/2)x)* (π/2)]
=-3/[(π/2)/sin²((π/2)x]
=-3/(π/2)
=-6/π