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微积分concave up and down

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微积分concave up and down
f(x)=(x^2)/(x^2+3)
(c) On what interval(s) is f concave upward?
On what interval(s) is f concave downward?
What are the x-coordinate(s) of the inflection point(s) of
微积分concave up and down
y = f(x) = x²/(x²+3)
On what interval(s) is f concave upward?     Answer: [-0.5,0.5]
On what interval(s) is f concave downward?    Answer: (-∞,-0.5] and [0.5, ∞) 
What are the x-coordinate(s) of the inflection point(s) of f? 
Answer: f(x) is an even function. Therefore f(x)=-f(x) for all x. 
Please see the proof from the figure later on.