put square test before null test in det calcs
put square test before null test in det calcs

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