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At an extreme point of a function f(X) t...

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

A

parallel to the x-axis

B

perpendicular to the x-axis

C

inclined at an angle `45^@` to the x-axis

D

inclined at an angle `60^@` to the x-axis

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The correct Answer is:
A
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