added tests for evalf
added tests for evalf

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