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On which interval is f(x) = x^3 - 3x decreasing?
ABelow -1 only
BBeyond 1 only
CBetween -1 and 1
DAbove 0 only
Answer & Solution
Correct answer: C. Between -1 and 1
f'(x) = 3(x^2 - 1) is negative only when x lies between -1 and 1.
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