Fix a bug in parametric_log_deriv_heu() in prde.py
Fix a bug in parametric_log_deriv_heu() in prde.py

shipci/sympy,farhaanbukhsh/sympy,sahilshekhawat/sympy,rahuldan/sympy,maniteja123/sympy,asm666/sympy,MridulS/sympy,pandeyadarsh/sympy,kaushik94/sympy,Curious72/sympy,kevalds51/sympy,Designist/sympy,cswiercz/sympy,Davidjohnwilson/sympy,jamesblunt/sympy,shikil/sympy,asm666/sympy,pbrady/sympy,atreyv/sympy,shipci/sympy,kevalds51/sympy,atreyv/sympy,garvitr/sympy,kaichogami/sympy,liangjiaxing/sympy,maniteja123/sympy,pandeyadarsh/sympy,ga7g08/sympy,sahmed95/sympy,abloomston/sympy,sahilshekhawat/sympy,VaibhavAgarwalVA/sympy,AkademieOlympia/sympy,garvitr/sympy,MechCoder/sympy,VaibhavAgarwalVA/sympy,jbbskinny/sympy,asm666/sympy,diofant/diofant,aktech/sympy,mafiya69/sympy,atsao72/sympy,Curious72/sympy,sampadsaha5/sympy,chaffra/sympy,souravsingh/sympy,abhiii5459/sympy,Arafatk/sympy,Mitchkoens/sympy,dqnykamp/sympy,bukzor/sympy,ga7g08/sympy,jaimahajan1997/sympy,skidzo/sympy,saurabhjn76/sympy,skidzo/sympy,hargup/sympy,cswiercz/sympy,saurabhjn76/sympy,lindsayad/sympy,saurabhjn76/sympy,Shaswat27/sympy,cswiercz/sympy,shikil/sympy,maniteja123/sympy,hargup/sympy,moble/sympy,dqnykamp/sympy,MridulS/sympy,drufat/sympy,jbbskinny/sympy,cccfran/sympy,Gadal/sympy,ChristinaZografou/sympy,ahhda/sympy,liangjiaxing/sympy,skidzo/sympy,abhiii5459/sympy,rahuldan/sympy,rahuldan/sympy,wanglongqi/sympy,debugger22/sympy,oliverlee/sympy,amitjamadagni/sympy,AunShiLord/sympy,kmacinnis/sympy,wyom/sympy,amitjamadagni/sympy,postvakje/sympy,liangjiaxing/sympy,moble/sympy,bukzor/sympy,beni55/sympy,AkademieOlympia/sympy,vipulroxx/sympy,sampadsaha5/sympy,kmacinnis/sympy,yukoba/sympy,shipci/sympy,emon10005/sympy,Designist/sympy,wyom/sympy,debugger22/sympy,beni55/sympy,jamesblunt/sympy,Gadal/sympy,sampadsaha5/sympy,sunny94/temp,Gadal/sympy,cccfran/sympy,mcdaniel67/sympy,jerli/sympy,ChristinaZografou/sympy,Vishluck/sympy,skirpichev/omg,mcdaniel67/sympy,Titan-C/sympy,Vishluck/sympy,jaimahajan1997/sympy,beni55/sympy,wyom/sympy,Titan-C/sympy,mafiya69/sympy,kmacinnis/sympy,chaffra/sympy,Mitchkoens/sympy,yashsharan/sympy,madan96/sympy,Mitchkoens/sympy,wanglongqi/sympy,wanglongqi/sympy,garvitr/sympy,hrashk/sympy,Shaswat27/sympy,sahilshekhawat/sympy,postvakje/sympy,sunny94/temp,pandeyadarsh/sympy,MechCoder/sympy,mafiya69/sympy,MechCoder/sympy,pbrady/sympy,souravsingh/sympy,meghana1995/sympy,jamesblunt/sympy,AunShiLord/sympy,toolforger/sympy,sahmed95/sympy,toolforger/sympy,VaibhavAgarwalVA/sympy,grevutiu-gabriel/sympy,jaimahajan1997/sympy,farhaanbukhsh/sympy,ga7g08/sympy,AunShiLord/sympy,vipulroxx/sympy,jerli/sympy,souravsingh/sympy,madan96/sympy,emon10005/sympy,farhaanbukhsh/sympy,sunny94/temp,kevalds51/sympy,dqnykamp/sympy,iamutkarshtiwari/sympy,jerli/sympy,lidavidm/sympy,lidavidm/sympy,moble/sympy,hargup/sympy,Curious72/sympy,ChristinaZografou/sympy,sahmed95/sympy,iamutkarshtiwari/sympy,pbrady/sympy,atreyv/sympy,lidavidm/sympy,Sumith1896/sympy,aktech/sympy,emon10005/sympy,aktech/sympy,chaffra/sympy,drufat/sympy,postvakje/sympy,Designist/sympy,hrashk/sympy,mcdaniel67/sympy,kaushik94/sympy,iamutkarshtiwari/sympy,kumarkrishna/sympy,debugger22/sympy,Titan-C/sympy,vipulroxx/sympy,shikil/sympy,Vishluck/sympy,Davidjohnwilson/sympy,oliverlee/sympy,yashsharan/sympy,hrashk/sympy,atsao72/sympy,AkademieOlympia/sympy,yashsharan/sympy,bukzor/sympy,abloomston/sympy,atsao72/sympy,cccfran/sympy,meghana1995/sympy,ahhda/sympy,Sumith1896/sympy,kumarkrishna/sympy,kaichogami/sympy,Davidjohnwilson/sympy,kaichogami/sympy,Shaswat27/sympy,Arafatk/sympy,meghana1995/sympy,jbbskinny/sympy,grevutiu-gabriel/sympy,yukoba/sympy,abhiii5459/sympy,ahhda/sympy,MridulS/sympy,oliverlee/sympy,madan96/sympy,toolforger/sympy,yukoba/sympy,drufat/sympy,kaushik94/sympy,kumarkrishna/sympy,grevutiu-gabriel/sympy,lindsayad/sympy,lindsayad/sympy,Arafatk/sympy,Sumith1896/sympy,abloomston/sympy