求lim((sin²x-sin²9)/(x-9)),x→9 lim((x+n)/(x-n))的x次方?
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1,lim((sin²x-sin²9)/(x-9)), x→9
=2[cosx(x+9)/2sinx(x-9)/2]/(x-9)
sinx(x-9)/2 ~(x-9)/2
则
2[cosx(x+9)/2*(x-9)/2]/(x-9)
=cos9
lim((x+n)/(x-n)) x→∞
=lim((1+n/x)/(1-n/x))
n/x~0 x→∞
=1,0,求lim((sin²x-sin²9)/(x-9)),x→9 lim((x+n)/(x-n))的x次方,x→∞
=2[cosx(x+9)/2sinx(x-9)/2]/(x-9)
sinx(x-9)/2 ~(x-9)/2
则
2[cosx(x+9)/2*(x-9)/2]/(x-9)
=cos9
lim((x+n)/(x-n)) x→∞
=lim((1+n/x)/(1-n/x))
n/x~0 x→∞
=1,0,求lim((sin²x-sin²9)/(x-9)),x→9 lim((x+n)/(x-n))的x次方,x→∞
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