Expression 2: "y" equals natural log left parenthesis, StartFraction, 1 Over cos left parenthesis, "x" , right parenthesis , EndFraction , right parenthesisy=ln1cosx
2
Expression 3: "y" equals "x" squaredy=x2
3
Expression 4: "x" equals StartFraction, pi Over 3 , EndFractionx=π3