Question

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

• A. $\frac{dy}{dx}=0$
• B. $\frac{dy}{dx}=1$
• C. $\frac{dx}{dy}=0$
• D. $\frac{dx}{dy}=1$

Answer 1

Answer: (C)

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