limx趋近于0 (tanx-sinx)/sin^3x

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limx趋近于0 (tanx-sinx)/sin^3x
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limx趋近于0 (tanx-sinx)/sin^3x
limx趋近于0 (tanx-sinx)/sin^3x

limx趋近于0 (tanx-sinx)/sin^3x

limx→0 (tanx-sinx)/sin^3x
=limx→0 (tanx-sinx)/x³
=limx→0 ((cosx)^(-2)-cosx)/3x²
=limx→0 (2(cosx)^(-3)sinx+sinx)/6sinx
=limx→0 (2(cosx)^(-3)+1)/6
=(2+1)/6
=1/2