x²-16<0
(x-4)(x+4)<0
x-4<0 ∨ x+4<0
x<4 ∨ x>-4
x∈(-4,4)
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x²-16<0
(x-4)(x+4)<0
x-4<0 ∨ x+4<0
x<4 ∨ x>-4
x∈(-4,4)