UPSC NDA II 2011 Mathematics Paper

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Question : 16 of 120

Marks: +1, -0

At an extreme point of a function f(x), the tangent to the curve is

parallel to the x-axis
perpendicular to the x-axis
inclined at an angle 45∘ to the x-axis
inclined at an angle 60∘ to the x-axis

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