​दिलेल्या वक्रातील सामान्य जर x-अक्षाच्या समांतर असेल तर 

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

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