(tanx-x)ln(1 x)/e^x(x-sinx)sin2x当x趋向0时的极限
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2016-11-04
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当x趋向0
lim (tanx-x)ln(1+x)/[e^x(x-sinx)sin2x]
=lim (tanx-x)*x/[(1+x)(x-sinx)*2x]
=lim (tanx-x)/[2(x-sinx)]
=lim (sinx-xcosx)/[2(x-sinx)]
=lim(cosx-cosx+xsinx)/[2(1-cosx)]
=lim xsinx/[4sin(x/2)]
=1
lim (tanx-x)ln(1+x)/[e^x(x-sinx)sin2x]
=lim (tanx-x)*x/[(1+x)(x-sinx)*2x]
=lim (tanx-x)/[2(x-sinx)]
=lim (sinx-xcosx)/[2(x-sinx)]
=lim(cosx-cosx+xsinx)/[2(1-cosx)]
=lim xsinx/[4sin(x/2)]
=1
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