किसी दिए गए वक्र का लंब x- अक्ष के समानांतर होता है यदि

1
\(\dfrac{dy}{dx}=0\)
2
\(\dfrac{dy}{dx}=1\)
3
\(\dfrac{dx}{dy}=0\)
4
\(\dfrac{dx}{dy}=1\)

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