Mathematics Relations and Functions Composition of Functions

f : R → [0, ∞) and g : [0, ∞) → R is defined by f(x) = x2 and g(x) = √x. Which one of the following is not true? 

1
gof (4) = 4
2
fog (-4) = 4
3
fog (2) = 2
4
gof (-2) = 2

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