Given The Function F X 4x 2 X 4 1 Defined On 3 3 A Locate All The Critical

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
 
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