证明tanx-sinx/sin^3(x)=1-cosx/cosxsin^2(x)

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证明tanx-sinx/sin^3(x)=1-cosx/cosxsin^2(x)证明tanx-sinx/sin^3(x)=1-cosx/cosxsin^2(x)证明tanx-sinx/sin^3(x)

证明tanx-sinx/sin^3(x)=1-cosx/cosxsin^2(x)
证明tanx-sinx/sin^3(x)=1-cosx/cosxsin^2(x)

证明tanx-sinx/sin^3(x)=1-cosx/cosxsin^2(x)
这个我会.骚后上图.