math fixes in code
math fixes in code

kaushik94/sympy,rahuldan/sympy,rahuldan/sympy,drufat/sympy,ChristinaZografou/sympy,aktech/sympy,skidzo/sympy,rahuldan/sympy,postvakje/sympy,skidzo/sympy,chaffra/sympy,jaimahajan1997/sympy,souravsingh/sympy,hargup/sympy,hargup/sympy,hargup/sympy,sampadsaha5/sympy,drufat/sympy,kaushik94/sympy,aktech/sympy,jaimahajan1997/sympy,yashsharan/sympy,yashsharan/sympy,ChristinaZografou/sympy,madan96/sympy,madan96/sympy,souravsingh/sympy,skidzo/sympy,madan96/sympy,souravsingh/sympy,chaffra/sympy,sampadsaha5/sympy,chaffra/sympy,drufat/sympy,yashsharan/sympy,sampadsaha5/sympy,postvakje/sympy,postvakje/sympy,kaushik94/sympy,aktech/sympy,ChristinaZografou/sympy,jaimahajan1997/sympy