If the tangent to a curve y = f(x) at a point P(x,y) meets x axis at T and G is the foot of the ordinate (y-coordinate) at P, then TG is called the cartesian subtangent.
If the normal to a curve y = f(x) at a point P(x,y) meets x axis at N and G is the foot of the ordinate (y-coordinate) at P, then NG is called the cartesian subnormal.
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