Expression 6: "s" left parenthesis, "x" , right parenthesis equals signum left parenthesis, sec left parenthesis, pi left parenthesis, "x" minus 1 half , right parenthesis , right parenthesis , right parenthesissx=signsecπx−12
6
Expression 7: "f" Subscript, 1 , Baseline left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis left brace, "f" left parenthesis, "x" , right parenthesis greater than 0 , right bracef1x=fxfx>0
7
Expression 8: "f" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis left brace, "f" left parenthesis, "x" , right parenthesis less than 0 , right bracef2x=fxfx<0