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  4. The tangent to a given curve y = f(x) is perpendicular to the x-axis if

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Q. The tangent to a given curve $y = f(x)$ is perpendicular to the $x-axis$ if

KCETKCET 2009Application of Derivatives

Solution:

If any tangent is perpendicular to $x$ -axis, then $\frac{d x}{d y}=0$