问题标题:
【极限求详解!(1)limx→0(tan2x)/(6x)(2)limx→1sin(x-1)/(√x-1)(3)limx→∞[(2x^2+1)/(x+2)]*sin2/x】
问题描述:

极限求详解!

(1)limx→0(tan2x)/(6x)(2)limx→1sin(x-1)/(√x-1)(3)limx→∞[(2x^2+1)/(x+2)]*sin2/x

宋成志回答:
  1)   limx→0(tan2x)/(6x)   =limx→0(2x)/(6x)   =1/3   (2)limx→1sin(x-1)/(√x-1)   =limx→1(x-1)/(√x-1)   =limx→1(√x+1)   =2   3)limx→∞[(2x^2+1)/(x+2)]*sin2/x   =limx→∞[(2+1/x^2)/(1+2/x)]*limx→∞(x*sin2/x)   =2*2   =4
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