Range of f(x)=tan(x)f(x) = \tan(x)f(x)=tan(x) on (−π/2,π/2)(−\pi/2, \pi/2)(−π/2,π/2)?
(−1,1)(-1, 1)(−1,1)
(−∞,∞)(-\infty, \infty)(−∞,∞)
[0,∞)[0, \infty)[0,∞)
[−π/2,π/2][-\pi/2, \pi/2][−π/2,π/2]