求极限lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4

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求极限lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4求极限lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4求极限lim(x→0)[∫(0.x)sintdt+lnc

求极限lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4
求极限lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4

求极限lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4
lim(x→0)[∫(0.x)sintdt+lncosx]/x∧4
=lim(x→0)[-cosx+1+lncosx]/x∧4
=lim(x→0)[sinx-sinx/cosx]/(4x^3)
=lim(x→0)[cosx-1/cos^2x]/(12x^2)
=lim(x→0)[-sinx-2sinx/cos^3x]/(24x)
=lim(x→0)[-cosx-(2cos^3x-6sin^2x)/cos^5x]/24
=[-1-(2-0)/1]/24
=-1/8

=lim(sinx-sinx/cosx)/4x^3 =lim(sinx/x)(cosx-1)/(cosx*4x^2) =lim(cosx-1)/4x^2) =lim-sinx/8x=-1/8