为什么这个Mathematica算了半天也没算出来d = 2\[Pi]\[Beta] = N[d/\!$\SubsuperscriptBox[\(\[Integral]$, $0$, $2 \[Pi]$]$SqrtBox[\(1 + \*SuperscriptBox[\(Cos[xx]$, $2$]\)] \[DifferentialD]xx\)\)]\[Theta] = ArcTan[Cos[x]]\[Phi]

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为什么这个Mathematica算了半天也没算出来d = 2*\[Pi]\[Beta] = N[d/\!\(\*SubsuperscriptBox[\(\[Integral]\), \(0\), \(2 \[Pi]\)]\(SqrtBox[\(1 + \*SuperscriptBox[\(Cos[xx]\), \(2\)]\)] \[DifferentialD]xx\)\)]\[Theta] = ArcTan[Cos[x]]\[Phi]

为什么这个Mathematica算了半天也没算出来d = 2\[Pi]\[Beta] = N[d/\!\(\SubsuperscriptBox[\(\[Integral]\), \(0\), \(2 \[Pi]\)]\(SqrtBox[\(1 + \*SuperscriptBox[\(Cos[xx]\), \(2\)]\)] \[DifferentialD]xx\)\)]\[Theta] = ArcTan[Cos[x]]\[Phi]