**given the function f(x) = 4x^2 / (x^4 + 1) defined on [-3,3]**

A) locate all the critical

points

B) use the first derivative test to locate the local maximum and minimum values

C) identify the absolute maximum and minimum values if they exist

I am trying to solve questions out of textbook and I do not understand. please help and explain if work is not clear. Thank you