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D=R
g'(x)=(x²+4-2x²)/(x²+4)²=(4-x²)/(x²+4)²
g'(x)>0 dla x∈(-2,2), g'(x)<0 dla x∈(-∞,-2) u (2,+∞)
dla x=-2 g(x)=min
dla x=2 g(x)=max
min= g(-2)=-2/(4+4)=-1/4
max=g(2)=2/8=1/4