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The function f(x) = x^3 - 3x has a local minimum at x equal to
A3
B0
C1
D-1
Answer & Solution
Correct answer: C. 1
f'(x) = 3x^2 - 3 vanishes at x = 1 and -1, and f''(1) = 6 is positive, so x = 1 is a minimum.
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