Question
if f(X)=xlxl then find f-1(x) can you please explain me the meaning and use of sgn
Joshi sir comment
f(x) = x|x| => f(x) = -x2 for negative real values of x and f(x) = x2 for positive real values of x
so f-1(x) = -√|x| for negative real values and = +√|x| for positive real values of x