求 lim(tan x-sin x)/(sin x)^3 x趋于0的极限值

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求 lim(tan x-sin x)/(sin x)^3 x趋于0的极限值
详细步骤

原式=lim(x->0)[(sinx/cosx-sinx)/sin³x]
=lim(x->0)[(1-cosx)/(sin²xcosx)]
=lim(x->0)[2sin²(x/2)/(sin²xcosx)]
=lim(x->0)[(x/sinx)²*(sin(x/2)/(x/2))²*(1/(2cosx))]
=1*1*(1/2) (利用重要极限lim(x->0)(sinx/x)=1)
=1/2

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