added cases for dense and sparse matrix in inv()
added cases for dense and sparse matrix in inv()
kaushik94/sympy,aktech/sympy,chaffra/sympy,postvakje/sympy,souravsingh/sympy,madan96/sympy,madan96/sympy,jaimahajan1997/sympy,postvakje/sympy,skidzo/sympy,sampadsaha5/sympy,yashsharan/sympy,sampadsaha5/sympy,sampadsaha5/sympy,drufat/sympy,yashsharan/sympy,chaffra/sympy,aktech/sympy,skidzo/sympy,souravsingh/sympy,kaushik94/sympy,jaimahajan1997/sympy,kaushik94/sympy,yashsharan/sympy,aktech/sympy,drufat/sympy,jaimahajan1997/sympy,drufat/sympy,souravsingh/sympy,chaffra/sympy,madan96/sympy,postvakje/sympy,skidzo/sympy