Expressão 4: "k" minus StartRoot, left parenthesis, negative "h" squared plus 2 "h" "x" plus "r" squared minus "x" squared , right parenthesis , EndRootk−−h2+2hx+r2−x2
4
Expressão 5: StartRoot, left parenthesis, negative "h" squared plus 2 "h" "x" plus "r" squared minus "x" squared , right parenthesis , EndRoot plus "k"−h2+2hx+r2−x2+k