Find the range of f(x)=tanx+cotxf(x) = \tan x + \cot xf(x)=tanx+cotx.
(−∞,−2]∪[2,∞)(-\infty, -2] \cup [2, \infty)(−∞,−2]∪[2,∞)
[2,∞)[2, \infty)[2,∞)
(−∞,∞)(-\infty, \infty)(−∞,∞)
None of the above