The function `f:R->R` defined by `f(x) =(e^|x|-e^-x)/(e^x+e^-x)` is

The function f defined by f(x)=(x+2)e^(-x) is

The function f defined by f(x)=(x+2)e^(-x) is

f: R to R is a function defined by f(x) =(e^(|x|) -e^(-x))/(e^(x) + e^(-x)) . Then f is:

The function f :R to R defined by f (x) = e ^(x) isd

The function f :R to R defined by f (x) = e ^(x) is

Let f : R->R be a function defined by f(x)=(e^(|x|)-e^(-x))/(e^x+e^(-x)) then --(1) f is bijection (2) f is an injection only (3) f is a surjection (4) f is neither injection nor a surjection