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The slope of the line normal to the curve f(x) = 2cos 4x at x = π/2 is … (a) -4√3 (b) -4 (c) √3/12

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The slope of the line normal to the curve f(x) = 2cos 4x at x = π/2 is …

(a) -4√3

(b) -4

(c) √3/12

(d) 4√3

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Answer is (c) √3/12

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