12. If length of tangent at any point on the curve $y = f ( x )$ intercepted between the point and the $x$-axis is of length 1 . Find the equation of the curve.
Let $A = \left[ \begin{array} { c c c } 1 & 0 & 0 \\ 0 & 1 & 1 \\ 0 & - 2 & 4 \end{array} \right]$. Suppose $A ^ { - 1 } = \frac { 1 } { 6 } \left( A ^ { 2 } + c A + d I \right)$ where $I$ is the
12. If length of tangent at any point on the curve $y = f ( x )$ intercepted between the point and the $x$-axis is of length 1 . Find the equation of the curve.\\