If normal of the curve is parallel to x axis then

Find the point on the curve x^(2) + y^(2)- 4xy + 2= 0 , where the normal to the curve is parallel to the X-axis.

The normal to a given curve is parallel to x-axis if :

The normal to a given curve is parallel to x-axis if

If normal the curve y=f(x) is parallel to X-axis, then correct statement is

If normal to the curve y = f(x) is parallel to x-axis, then A) dy/dx=0 B) dy/dx=1 C) dx/dy=0 D) dx/dy=1