Let A be a subset of real numbers. Suppose f : A → R and g : A →R be one - one functions then1f + g is one - one2f + g need not be defined3f + g need not be one - one4None of theseAnswer & explanation+Correct answer: option 3Let A = [ 0 , π/2] , f(x) = sin x and g(x) = cos x.
