fix cot fdiff
fix cot fdiff

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