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**1. Homework Statement**

If the domain of f is restricted to the open interval (-pi/2,pi/2), then the range of f(x) = e^(tanx) is

A) the set of all reals

b the set of positive reals

c the set of nonnegative reals

d R: (0,1]

e none of these

(from barron's How to prep for ap calc)

**2. Homework Equations**

Above

**3. The Attempt at a Solution**

Range of tanx is all real numbers. The range for e^(x) for all real numbers is positive reals. The answers must be b or c

**Conflict**

The answer sheet states that b is the correct answer. How come? isn't b and c the same? What's the difference between all positive reals and all non negative reals?