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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