find monotonicity intervals of f(x) = (x^2 + 1) / (x^2 - 2)

[mathhelp]

What does it means to find the monotonicity intervals of f(x) = (x^2 + 1) / (x^2 - 2)?

Thanks

 

[skeeter]

http://mathworld.wolfram.com/MonotonicFunction.html