求心形线r=a(1-cosθ)(a>0)全长,注意中间是减,我老算出来是4a

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求心形线r=a(1-cosθ)(a>0)全长,注意中间是减,我老算出来是4a求心形线r=a(1-cosθ)(a>0)全长,注意中间是减,我老算出来是4a求心形线r=a(1-cosθ)(a>0)全长,注

求心形线r=a(1-cosθ)(a>0)全长,注意中间是减,我老算出来是4a
求心形线r=a(1-cosθ)(a>0)全长,注意中间是减,我老算出来是4a

求心形线r=a(1-cosθ)(a>0)全长,注意中间是减,我老算出来是4a

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