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The tangent to y = x^3 - 3x is parallel to the x-axis at which values of x?
A0 only
B2 and -2
C3 and -3
D1 and -1
Answer & Solution
Correct answer: D. 1 and -1
Setting 3x^2 - 3 = 0 gives x^2 = 1, so x = 1 or x = -1.
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