A function is given by a formula. Determine whether it is one-to-one. f(x) = x2 − 12 Yes, it is one-to-one. No, it is not one-to-one. A function is given by a formula. Determine whether it is one-to-one. g(x) = 1 − sin(x) Yes, it is one-to-one. No, it is not one-to-one.