Let `f(x) = {{:(1+|x|, x lt -1),([x],x ge -1):}` where [.] denote the greatest integer function . Then find the value of f{f(-2.3)}

Let f: (2,4) rarr (1,3) where f(x) = x - [x//2] (where [ .] denotes the greatest integer function), then f^(-1)(x) is

If f(x) = (sin([x]pi))/(x^2+x+1) , where [ .] denotes the greatest integer function , then a)f is one-one b)f is not one-one and non-constant c)f is a constant function d)none of these