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Clear[p, t, mq, ep, gh]
ff[p_] := 1/(Exp[ep[p]/t] + 1);

D[ff[p], ep[p]]
(*½«º¯Êýff[p]¶Ôep[p]Çóµ¼£¬¿ÉÒÔʵÏÖ*)

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-(E^((ep[p]/t))/((1 + E^(ep[p]/t))^2 t))£»

ÏëʵÏÖµÄÊÇ£¬½«D[ff[p], ep[p]]ÖеÄp½øÐлý·Ö£º
Clear[p, t, mq, ep, gh]
ff[p_] := 1/(Exp[ep[p]/t] + 1);

D[ff[p], ep[p]]

Integrate[D[ff[p], ep[p]], {p, 0, 100}]
ÕâÀïÉÐδ¸ø³öep[p]µÄ±í´ïʽºÍtµÄÊýÖµ¡£

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Clear[p, t, mq, ep, gh]
ff[p_] := 1/(Exp[ep[p]/t] + 1);
t = 50;
ep[p_] := Sqrt[p^2 + 60^2];
D[ff[p], ep[p]]

NIntegrate[D[ff[p], ep[p]], {p, 0, 100}]

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