removed import of diff in beta__function.py
removed import of diff in beta__function.py

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