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Which of the following functions is one-...

Which of the following functions is one-one ? `(1)f:R->R` defined as `f(x)=e^(sgn x)+e^(x^2)` `(2) f:[-1,oo) ->(0,oo)` defined by `f(x)=e^(x^2+|x|)` `(3)f:[3,4]->[4,6]` defined by `f(x)=|x-1|+|x-2|+|x-3|+x-4|` `(4) f(x) =sqrt(ln(cos (sin x))`

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