A) \[{{x}^{2}}\]
B) \[{{y}^{2}}\]
C) a constant
D) \[x\]
E) \[y\]
Correct Answer: B
Solution :
\[\because \]Length of sub tangent \[=\frac{y}{\left( \frac{dy}{dx} \right)}\] and length of subnormal \[=y\frac{dy}{dx}\] \[\therefore \]Product of subtangent and subnormal \[=\frac{y}{\left( \frac{dy}{dx} \right)}.y\frac{dy}{dx}={{y}^{2}}\]
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