core: Remove dead assignments and unused imports from mul
core: Remove dead assignments and unused imports from mul

saurabhjn76/sympy,mcdaniel67/sympy,Sumith1896/sympy,atsao72/sympy,maniteja123/sympy,jbbskinny/sympy,liangjiaxing/sympy,Vishluck/sympy,abhiii5459/sympy,debugger22/sympy,sampadsaha5/sympy,oliverlee/sympy,rahuldan/sympy,garvitr/sympy,Gadal/sympy,jbbskinny/sympy,sahmed95/sympy,beni55/sympy,pbrady/sympy,mafiya69/sympy,pandeyadarsh/sympy,jamesblunt/sympy,AkademieOlympia/sympy,hargup/sympy,srjoglekar246/sympy,ChristinaZografou/sympy,AkademieOlympia/sympy,dqnykamp/sympy,farhaanbukhsh/sympy,yashsharan/sympy,rahuldan/sympy,kaushik94/sympy,lidavidm/sympy,lindsayad/sympy,kaushik94/sympy,madan96/sympy,atreyv/sympy,Arafatk/sympy,dqnykamp/sympy,sunny94/temp,meghana1995/sympy,flacjacket/sympy,chaffra/sympy,pandeyadarsh/sympy,sahmed95/sympy,Gadal/sympy,shipci/sympy,abloomston/sympy,Mitchkoens/sympy,kaichogami/sympy,jerli/sympy,AkademieOlympia/sympy,souravsingh/sympy,yashsharan/sympy,VaibhavAgarwalVA/sympy,amitjamadagni/sympy,sahilshekhawat/sympy,hrashk/sympy,kevalds51/sympy,bukzor/sympy,AunShiLord/sympy,skidzo/sympy,drufat/sympy,hargup/sympy,liangjiaxing/sympy,Titan-C/sympy,hargup/sympy,kumarkrishna/sympy,wyom/sympy,lindsayad/sympy,Sumith1896/sympy,jaimahajan1997/sympy,wanglongqi/sympy,diofant/diofant,jerli/sympy,Curious72/sympy,sahilshekhawat/sympy,kevalds51/sympy,lindsayad/sympy,bukzor/sympy,souravsingh/sympy,jamesblunt/sympy,ga7g08/sympy,Mitchkoens/sympy,Designist/sympy,iamutkarshtiwari/sympy,wanglongqi/sympy,skidzo/sympy,iamutkarshtiwari/sympy,asm666/sympy,shikil/sympy,farhaanbukhsh/sympy,hrashk/sympy,pbrady/sympy,sampadsaha5/sympy,jbbskinny/sympy,skidzo/sympy,shikil/sympy,cswiercz/sympy,chaffra/sympy,Shaswat27/sympy,abhiii5459/sympy,debugger22/sympy,sunny94/temp,shipci/sympy,liangjiaxing/sympy,bukzor/sympy,Designist/sympy,maniteja123/sympy,souravsingh/sympy,moble/sympy,jaimahajan1997/sympy,mafiya69/sympy,Shaswat27/sympy,grevutiu-gabriel/sympy,lidavidm/sympy,debugger22/sympy,asm666/sympy,asm666/sympy,toolforger/sympy,vipulroxx/sympy,garvitr/sympy,kumarkrishna/sympy,minrk/sympy,Davidjohnwilson/sympy,wanglongqi/sympy,postvakje/sympy,emon10005/sympy,ChristinaZografou/sympy,Shaswat27/sympy,aktech/sympy,Mitchkoens/sympy,postvakje/sympy,amitjamadagni/sympy,madan96/sympy,kaichogami/sympy,kmacinnis/sympy,kevalds51/sympy,iamutkarshtiwari/sympy,grevutiu-gabriel/sympy,MridulS/sympy,atsao72/sympy,MechCoder/sympy,rahuldan/sympy,VaibhavAgarwalVA/sympy,kmacinnis/sympy,sahilshekhawat/sympy,vipulroxx/sympy,mcdaniel67/sympy,jerli/sympy,emon10005/sympy,ahhda/sympy,sunny94/temp,Titan-C/sympy,MridulS/sympy,atsao72/sympy,grevutiu-gabriel/sympy,mcdaniel67/sympy,emon10005/sympy,drufat/sympy,cccfran/sympy,MridulS/sympy,atreyv/sympy,ahhda/sympy,vipulroxx/sympy,kmacinnis/sympy,ChristinaZografou/sympy,ga7g08/sympy,minrk/sympy,abloomston/sympy,saurabhjn76/sympy,ga7g08/sympy,Curious72/sympy,Vishluck/sympy,moble/sympy,Vishluck/sympy,saurabhjn76/sympy,cccfran/sympy,garvitr/sympy,ahhda/sympy,Sumith1896/sympy,Gadal/sympy,beni55/sympy,pandeyadarsh/sympy,kaushik94/sympy,kumarkrishna/sympy,Designist/sympy,skirpichev/omg,shipci/sympy,atreyv/sympy,Curious72/sympy,moble/sympy,hrashk/sympy,aktech/sympy,mafiya69/sympy,chaffra/sympy,abloomston/sympy,shikil/sympy,maniteja123/sympy,Titan-C/sympy,meghana1995/sympy,yashsharan/sympy,cswiercz/sympy,MechCoder/sympy,yukoba/sympy,oliverlee/sympy,postvakje/sympy,Arafatk/sympy,jaimahajan1997/sympy,drufat/sympy,sampadsaha5/sympy,toolforger/sympy,yukoba/sympy,wyom/sympy,sahmed95/sympy,toolforger/sympy,Davidjohnwilson/sympy,lidavidm/sympy,cccfran/sympy,oliverlee/sympy,jamesblunt/sympy,dqnykamp/sympy,wyom/sympy,Arafatk/sympy,yukoba/sympy,aktech/sympy,VaibhavAgarwalVA/sympy,pbrady/sympy,AunShiLord/sympy,AunShiLord/sympy,meghana1995/sympy,cswiercz/sympy,Davidjohnwilson/sympy,kaichogami/sympy,farhaanbukhsh/sympy,abhiii5459/sympy,MechCoder/sympy,madan96/sympy,beni55/sympy