Find the derivative of the function and evaluate the derivative at the given x-value.f(x) = 1 - x3  at x = 1

A. f'(x) = 1 - 3x; f'(1) = -2
B. f'(x) = -3x2; f'(1) = -3
C. f'(x) = 3x2 - 1; f'(1) = 2
D. f'(x) = -3x; f'(1) = -3


Answer: B

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