求极限lim.[( tanx-sinx) /(sin^2 2x)]
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求极限lim.[( tanx-sinx) /(sin^2 2x)]
求极限lim.[( tanx-sinx) /(sin^2 2x)]
求极限lim.[( tanx-sinx) /(sin^2 2x)]
lim(x→0) [( tanx-sinx) /(sin^2 2x)]
=lim(x→0) [tanx( 1-cosx) /(2x)^2]=lim(x→0) [x*x^2/2] /(2x)^2=0