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If f(x) = |x² – 9x + 20|, then f’(x) is equal to

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The derivative of cos^–1 (2x² – 1) with respect to cos^–1 x is

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If then f’(x) is equal to

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If then the derivative of f(x) in the interval [0, 7] is

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If f(x) = |x – 3| and g(x) = fof(x), then for x > 10, g’(x) is equal to