adding #todo for performance issues with simplify
adding #todo for performance issues with simplify

kaushik94/sympy,jerli/sympy,jaimahajan1997/sympy,skidzo/sympy,hargup/sympy,kaushik94/sympy,yashsharan/sympy,Titan-C/sympy,postvakje/sympy,lindsayad/sympy,rahuldan/sympy,madan96/sympy,Titan-C/sympy,postvakje/sympy,skidzo/sympy,hargup/sympy,Curious72/sympy,mafiya69/sympy,Curious72/sympy,jerli/sympy,aktech/sympy,sampadsaha5/sympy,kaushik94/sympy,aktech/sympy,postvakje/sympy,ChristinaZografou/sympy,hargup/sympy,rahuldan/sympy,Curious72/sympy,jaimahajan1997/sympy,rahuldan/sympy,lindsayad/sympy,yashsharan/sympy,jaimahajan1997/sympy,drufat/sympy,ChristinaZografou/sympy,souravsingh/sympy,Titan-C/sympy,mafiya69/sympy,chaffra/sympy,sampadsaha5/sympy,mafiya69/sympy,chaffra/sympy,drufat/sympy,souravsingh/sympy,madan96/sympy,chaffra/sympy,ChristinaZografou/sympy,madan96/sympy,drufat/sympy,skidzo/sympy,souravsingh/sympy,jerli/sympy,yashsharan/sympy,sampadsaha5/sympy,aktech/sympy,lindsayad/sympy