lim(x→1) sin(1-x)/(1-x^2)
=lim(x→1) sin(1-x)/(1+x)(1-x)
=lim(x→1) [sin(1-x)/(1-x)]*lim(x->1)1/(1+x)
=1*1/2
=1/2
求极限lim(x→1) sin(1-x)/(1-x^2)
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